Three days after the Boston Marathon bombing, the Democratic candidates for the Massachusetts special Senate election still aren’t sure how to proceed with an imminent primary.

Campaigns for the top two Democrats — Reps. Edward J. Markey and Stephen F. Lynch — have spoken informally. But they have no agreement on a specific date to resume political activities after suspending them earlier this week.

Markey and Lynch, plus all three Republicans seeking the GOP nomination, were scheduled to attend Thursday’s interfaith service, according to The Boston Globe. President Barack Obama and Massachusetts Gov. Deval Patrick, a Democrat, spoke at the service.

Now comes the uneasy transition back to politics, with the primary scheduled for April 30.

“No decisions have been made,” Lynch spokesman Conor Yunits said in an email. “We have cancelled everything through Friday.”

(Read more about the Massachusetts delegation in Roll Call: Boston’s Crisis Coincides With State’s Fall in Clout)

The Markey campaign has suspended all canvassing, phone-banking and fundraisers at least through the end of Friday. Their TV ads are canceled at least through Friday as well.

The Democratic primary debate scheduled for Thursday night has also been canceled.

“President Obama and Gov. Patrick’s hopeful message to the people of the commonwealth today will go a long way toward helping the community heal from this senseless tragedy,” Markey spokesman Andrew Zucker said. “While we continue our suspension of the campaign, like the people of Boston we’re taking this day by day, and will resume normal campaign activities at an appropriate time.”

(Read more about the president’s comments following the bombing in Roll Call: Obama on Boston Blasts: ‘We Will Hold Them Accountable’)

The winner of the Democratic primary will be heavily favored to win the June 25 special election, no matter who emerges from the GOP primary. The candidates are vying for the seat vacated by Democrat John Kerry, who was appointed secretary of State.