Philadelphia police this morning said they are looking for a 33-year-old city man in connection with the fatal shooting Saturday of Philadelphia police Sgt. Stephen Liczbinski.

Police identified the suspect at large as Eric Floyd, 33, currently of Clearfield Street, Philadelphia. Police said Floyd had escaped from a halfway house in Reading, and is considered to be armed and dangerous.

Police said at least three men were involved in the robbery and shooting of Sgt. Liczbinski, 39, on Saturday just before noon.

Liczbinski was responding to the robbery of a bank inside a grocery store around 11:30 a.m. Saturday. The suspects fired at Liczbinski after he confronted them nearby, police have said.

Police Deputy Commissioner William Blackburn did not identify the person police believe to be the shooter. But he said, “I would call it an execution. The sergeant didn’t have a chance.”

The gun was a Chinese-made SKS assault rifle, which holds 30 rounds, and had 25 bullets inside when it was found.

Police shot and killed one of the alleged robbers after the robbery. Police identified him as Howard Cain, 33 and said he had lived at the same address as Floyd.

A third suspect, Levon Warner, 38, has been charged with murder, robbery, conspiracy and related offenses. He called police soon after the robbery, reporting that his Chrylser Town and Country van had been stolen. Police now believe he was part of the crime.