US police departments from New York to Los Angeles boosted security and were on heightened alert Monday after a double blast killed at least two people and injured 23 others at the Boston marathon.
While there is yet no official word on whether the explosions were an act of terrorism, New York and other cities quickly took extra precautions.
New York Mayor Michael Bloomberg said security was being stepped up at “strategic locations and critical infrastructure, including our subways.”
“We have 1,000 members of the NYPD assigned to counterterrorism duties, and they — along with the entire NYPD and the investments we have made in counterterrorism infrastructure — are being fully mobilized to protect our city,” Bloomberg said in a statement.
“As law enforcement authorities investigate today’s explosions in Boston, I ask all New Yorkers to keep the victims and their families in your thoughts and prayers.”
Police in the nation’s capital of Washington, DC — which like New York was a target of the September 11, 2001 terrorist attacks — have also “heightened security,” spokeswoman Saray Leon told AFP.
Los Angeles police chief Charlie Beck announced an increased police presence at “all scheduled sports events in the near future,” beginning with the Dodgers-San Diego Padres baseball game on Monday evening.
The additional police presence would include deployment of bomb-squad personnel, dogs and other “precautions geared to preventing a similar event.”
Security was also stepped up at train stations, government buildings, shopping centers and “places where people congregate,” Los Angeles County Sheriff Lee Baca said.
Police in the West Coast city of San Francisco said they were on “heightened alert” and urged people to call 911 if they see anything suspicious “in light of the Boston marathon explosions.”
WATCH: Video shows NYPD beating anti-police violence protesters with batons
Protesters of police violence received a harsh reception from the New York Police Department on Friday evening.
The protesters had marched to the Barclays Center, where they were met with a large police presence.
Heavy police presence posted outside of Barclays Center. If you’re protesting, please stay safe.
Trump is enacting the presidency ‘George Wallace never had’: Conservative columnist
On Friday, writing for The Washington Post, conservative columnist Max Boot tore into President Donald Trump's legacy on race.
"We know how a normal president responds when a white police officer ignites furious protests by killing a black man. It is the way President Barack Obama responded in 2014 after a grand jury refused to indict a white police officer who had fatally shot Michael Brown in Ferguson, Mo., and the National Guard had to be called in to deal with looting and fires," wrote Boot. "Obama expressed sympathy for the protesters — their anger, he noted, was 'rooted in realities that have existed in this country for a long time' — while making clear that he had no sympathy with violence: 'Burning buildings, torching cars, destroying property, putting people at risk — that’s destructive and there’s no excuse for it. Those are criminal acts. And people should be prosecuted if they engage in criminal acts.'"
White House goes into lockdown as George Floyd protests in DC rage hotter
On Friday, CBS News reporter Weijia Jiang reported that the White House has now issued lockdown orders.
The development comes as protests against the police killing of George Floyd in Minneapolis, Minnesota have spread to Washington, D.C. and crowds are growing angrier. Earlier in the evening, a protester scaled the wall of a federal building and spray-painted an obscene anti-Trump message above a window.
The White House is currently under lockdown orders. https://t.co/LasnCIjkum