Extremism online
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Following Saturday's attack in London, Facebook is promising to do more to keep terrorists off its network. But stopping extremists from spreading their message of hate across the web is so difficult because it requires vigilance and cooperation from law enforcement, internet users, and most importantly social media companies, experts told Fox 5. While Facebook and others say they already work to combat online extremism, some critics said that is not nearly enough.

Music festival security
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The NYPD is out in force at the Governors Ball three-day music festival on Randall's Island in light of the recent concert attack in England. The Governors Ball, just like Ariana Grande, attracts a young crowd of music fans. The department has extra security stationed at the festival but said no threat has been made.

Lopez Rivera breaks silence
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A Puerto Rican nationalist recently freed from prison will still march in a Manhattan parade ? even though he has stepped aside from a formal role as "Procer de la Libertad" ? National Freedom Hero. It is unclear whether that development will placate critics who objected to the parade committee's original plan to honor Oscar Lopez Rivera, who was part of a militant group responsible for bombings in the 1970s and '80s that killed and maimed New Yorkers.

FALN victim's son condemns parade
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A bomb exploded at Fraunces Tavern on January 24, 1975, killing four people, including Frank Conner, a banker. FALN, a Puerto Rican militant group, claimed responsibility for that and about 100 bombings across the country. The bombing is back in the headlines because Oscar Lopez Rivera, co-founder and leader FALN, is being honored as a national freedom hero in next week's Puerto Rican Day Parade.

Massacre in Egypt
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Fighter jets from Egypt have crossed the border and bombed militant bases in eastern Libya, according to Egypt's president. The strike was in response to a deadly attack on a bus carrying Coptic Christians south of Cairo Friday.

Manchester bombing aftermath
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New details are emerging about the man who carried out the suicide bombing at an Ariana Grande concert in England. Police continue to conduct raids and make arrests as it seems clear now that Salman Abedi was part of a larger terror network. Abedi traveled to Syria and may have received direct training from ISIS in the months before this gruesome attack, according to reports. Authorities have taken Abedi's brother, who is suspected of having ties to ISIS, and his father into custody in Libya.

Manchester investigation
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This investigation into the Manchester bombing now spans two continents. Police arrested the father and a brother of suicide bomber Salmen Abedi in Libya and another brother in Manchester. Law enforcement teams are hunting for anyone else who may have been involved in the United Kingdom. Authorities are confident he had help carrying out Monday's attack. Investigators believe that Abedi, a British citizen, traveled to Syria recently and was in Libya days before taking a train to Manchester and detonating a powerful and sophisticated explosive.

Britain on alert
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As officials hunted for accomplices of a suicide bomber and Britain's prime minister warned another attack could be "imminent," thousands of people poured into the streets of Manchester in a defiant vigil Tuesday for victims of a blast at a pop concert — the latest apparent target of Islamic extremists seeking to rattle life in the West.

Manchester explosion
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United Kingdom police are treating an apparent explosion outside an Ariana Grande concert at Manchester Arena as a "terrorist incident" until they know otherwise. At least 19 people are dead and more than 50 wounded, police said. Witnesses told news outlets that they heard a "loud bang" and then people started screaming and running out of the arena.

Oscar Lopez Rivera released
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Puerto Rico nationalist Oscar Lopez Rivera was freed from house arrest Wednesday after decades in custody in a case that transformed him into a martyr for his supporters but had outraged those who lost loved ones in a string of bombings.

Travel alert for Europe
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The U.S. State Department has issued a travel alert for Americans who plan to travel to Europe. That alert is effective for at least the next four months. The alert is a response to a sequence of recent terror attacks throughout Europe, including France, Russia, Sweden, and the United Kingdom. It also goes hand-in-hand with the beginning of the summer travel season.

Paris shooting
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A known extremist opened fire on police officers late Thursday on the Champs-?lys?es boulevard in Paris, officials said. One officer was killed, others were wounded, and a foreign tourist was hurt. Within hours, ISIS claimed responsibility for the attack, which came just days ahead of a tense presidential election. Paris police spokeswoman Johanna Primevert told The Associated Press that the attacker targeted police guarding the area near the Franklin Roosevelt subway station at the center of the avenue.

NYPD security
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Security is always high during Passover, but the NYPD is on heightened alert since this year Passover coincides with the Christianity's Holy Week and comes just days after terror attacks on Christian churches in Egypt. The NYPD maintained a visible presence for Passover outside Central Synagogue in Midtown. At Park East Synagogue, counterterrorism officers not only watched who went in, but also who walked by. The number of private security on site at Temple Emanu-El has been doubled. Sources told Fox 5 unmarked plainclothes officers are in the area as well as constant mobile patrols instead of fixed-post officers.

Sweden attack
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A stolen truck plowed into a shop in Stockholm. The truck, carjacked from Swedish beermaker Spendrups, crashed into the Ahlens department store killing at least four people and injuring at least 14, reported Swedish media.

Subway bombing
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An explosion inside a subway station in St. Petersburg, Russia, killed 11 people and injured at least 50 on Monday, according to Russian state television.

Confessed racist murderer
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A white racist accused of fatally stabbing a 66-year-old stranger on a Manhattan street because he was black says he'd intended it as "a practice run" in a mission to deter interracial relationships. Prosecutors have charged James Harris Jackson with murder as an act of terrorism. Earlier, he was charged with murder as a hate crime. If convicted, he could face life in prison.

London attack
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At least five people are dead and 40 injured in London after a man driving a vehicle slammed into pedestrians on Westminster Bridge, crashed the vehicle through railings on the grounds of British Parliament, striking more pedestrians, and then ran into Old Palace Yards and attacked a police officer with a knife, according to Scotland Yard.

NYC bomb threats
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Five bomb threats were made against Jewish organizations in New York City Tuesday morning, igniting another wave of anti-Semitism across the country.

Terror support arrest
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Prosecutors say a man accused of trying to join militant Islamic extremists in Syria was removed from his home in New York City's suburbs last week after he tried to cut off his own tattoos with a knife and threatened to behead his mother.

Interview: Commissioner O'Neill
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Police Commissioner James O'Neill, who has been with the NYPD for almost 35 years, spoke to Ernie Anastos about his job and the job of the entire department.