Probe continues, Senate campaigns suspended

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The scene of two explosions at the finish line of the Boston Marathon that killed three people and injured more than 140 remains closed as city, state and federal law enforcement agencies investigate.

The area around Copley Plaza was blocked to vehicles and pedestrians by yellow police tape early Tuesday as the city awoke the day after the explosions.

The crime scene was secured by police and the National Guard.

Highway exits to the area from the Massachusetts Turnpike and Storrow Drive were closed to traffic, and police were urging commuters to find alternate routes.

The MBTA is running as normal, but Green Line trolleys are not stopping at the Copley Station subway stop.

Two bombs exploded seconds apart at about 2:50 p.m. Monday as many runners were crossing the finish line.

Meanwhile, U.S. Rep. William Keating, a member of the congressional Homeland Security Committee, says bombings appear to be a coordinated attack.

Keating, who said he spoke to the chairman of the committee on Monday, said the bombs have all the hallmarks of a domestic or international terrorist incident.

Keating, who hasn’t been formally briefed on the explosions, said the marathon is an international event that draws runners from around the world. He also noted that Monday was Tax Day, which could provide motivation for domestic terrorists.

He said two other unexploded devises were found, but he didn’t have any information about them.

Keating said he’s confident federal, state and local law enforcement officials will bring those responsible to justice.

In other local news, All five candidates in Massachusetts special U.S. Senate race are suspending their campaigns following the explosions.

Democrat Edward Markey said he was disturbed and saddened by the explosions and has put off campaign activities including fundraising and television advertisements.

Republicans Daniel Winslow said his heart goes out to the injured and he’s also ordered his campaign to suspend all activities.

Fellow Republican Michael Sullivan canceled all campaign activities for the day and said he was confident law enforcement officials would find those responsible.

Republican Gabriel Gomez was running in the race, and tweeted his prayers were with all the runners and spectators. He’s also suspending his campaign.

Democrat Stephen Lynch also suspended campaigning. He called the explosions a terrible tragedy and said his prayers were with the injured.