A group of Senators has delayed a high-profile announcement of a sweeping immigration reform proposal set for Tuesday because of the bombings at the Boston Marathon.

The eight-member group was scheduled to appear at an 11 a.m. news conference at the Dirksen Senate Building, joined by immigration advocates and other stakeholders, to lay out the details of the legislation that would represent the most ambitious overhaul of the U.S. immigration system in three decades.

“All eight senators believed the focus should be on victims, not other issues,” a Senate aide said late Monday. The group still intends to file the bill on Tuesday but will hold the news conference on another day.

Sen. Charles E. Schumer (D-N.Y.), a member of the group, said in a message on his Twitter account: “Thoughts & prayers are with everyone in Boston.”

The Senate Judiciary Committee has scheduled two hearings on the bill for Friday and Monday.