Several candidates for Massachusetts' Senate special election have suspended campaign activity in response to the explosions that disrupted the Boston Marathon on Monday afternoon, killing two people and injuring more than two dozen.

Rep. Ed Markey (D-Mass.) is suspending canvassing, phone banking, fundraising and television advertisements for an indefinite period of time.

In an interview Conor Yuntis, a spokesman for Rep. Steve Lynch (D-Mass.), Markey's primary rival, said the congressman also was suspending all campaign activity in light of the bombings.

“We’re pulling down everything,” Yuntis said. “We’re encouraging all our supporters to spend time with their loved ones.”

Republican candidate and former Navy SEAL Gabriel Gomez ran in the marathon, tweeting a finish time of 4:08:03, which would have put him at the finish line shortly before the first explosion. Gomez posted a second tweet to his account extending "thoughts and prayers to all the runners, families and spectators at the Marathon today -- keep safe and keep those hurt in your prayers."

Gomez spokesman Will Ritter said that Gomez is unharmed and that the campaign is suspending its activities for the day. "We are all OK. Watching the news at my apartment in the Back Bay," wrote Ritter in an email.

Attorney William Sullivan, another Republican candidate, also has suspended campaign activity for the day.

All four are competing for the seat seat vacated by Secretary of State John Kerry earlier this year. The primary will be held April 30 and the general election June 25. Gov. Deval Patrick (D) appointed former aide Mo Cowan to the seat for the interim.