MEMPHIS, Tenn. (AP) — The latest on the fatal shooting of a police officer in Memphis, Tennessee (all times local):

5:30 p.m.

The ex-con accused of killing a Memphis police officer has turned himself into federal authorities, ending an intensive two-day manhunt.

Louis Goggans, spokesman for the United States attorney's office in Memphis, said Tremaine Wilbourn turned himself over at the federal building. His family was with him when he arrived.

A warrant was issued Sunday for his arrest on a charge of first-degree murder.

Wilbourn is accused of shooting Officer Sean Bolton Saturday night when the officer interrupted a drug deal.

A news conference is scheduled later this evening.

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5:10 p.m.

After a two-day manhunt for an ex-con accused of gunning down a Memphis Police officer, city officials cited a "material development" in the case and cancelled a news conference to announce an increased reward for his capture.

Memphis city spokeswoman Dewanna Smith said reporters will be advised later about the development.

Officer Sean Bolton was shot Saturday night when he interrupted a drug deal in a Mercedes Benz.

Police have since been looking for a 29-year-old convicted bank robber named Tremaine Wilbourn. Police had been seeking him on a warrant charging him with murder.

Officials had called a press conference for Monday night to announce an increase in the reward for information leading to his capture. But the city canceled it minutes before it was to begin.