By Andrew Firestone

Wounded Somerville detective Mario Oliveira was rushed back to Massachusetts General Hospital Thursday just moments after he was released and honored by the mayor and police chief.

Oliveira’s stitches became loose shortly after he returned to his home in Billerica, said city spokeswoman Jackie Rossetti, and he was treated without incident.

Oliveira had been hospitalized since Nov. 2 when he was shot four times while serving an arrest warrant on Gibbens Street. The suspect, Matthew Krister, 21, allegedly fired at Oliveira and was killed in the shootout. Oliveira was serving the warrant with federal agents from the Bureau of Alcohol, Tobacco and Firearms.

On Thursday, a crowd including Mayor Joseph Curtatone and Acting Police Chief Michael Cabral, cheered and applauded as Oliveira made his way to a police cruiser which would take him home with his wife Kristy and two daughters.

Oliveira had a statement read by Acting Police Chief Mike Cabral paying condolences to Krister’s family. “Their family as well as my family, has been forever affected from this tragic incident,” the statement said.

“I have received phone calls and visits from dignitaries such as Governor Deval Patrick, the United States Attorney General Eric Holder, police chiefs, Somerville Board of Aldermen, the ATF Special Agent in Charge Guy Thomas, ATF representatives from Boston to Washington, D.C,. and get well wishes from school children and the Somerville community,” Oliveira said in his statement.

Oliveira’s life was in doubt after the shooting, said surgeon Dr. David King, who reported immediate life-threatening wounds to the chest and abdomen. King was pleased with Oliveira’s recovery, saying that after surgery, “He woke up with the same great spirit that he has today.”

Mayor Curtatone said Oliveira’s recovery was “a miracle.”

ATF Agent Guy Davis declined to comment on the specifics of the shooting, but called the incident “a sobering reminder of how dangerous our job is,” while acknowledging Oliveira’s continued work with the ATF.

William Tauro contributed to this report.