Manhunt underway for 2 'dangerous' men who escaped from a Philadelphia correctional facility and weren't discovered missing until nearly a day later

Philadelphia officials are offering a $20,000 reward for information about two men, including one charged in multiple homicides, who escaped a correctional facility and weren't discovered missing until nearly a full day after they slipped through a hole in a fence.

"We are adamant and working tirelessly to get these two dangerous individuals back in custody and that is the focus of our investigation," Blanche Carney, the Department of Prisons commissioner, said during a news conference Monday.

The manhunt comes in the wake of other recent jail breaches, including four men who escaped a detention center in Hinds County, Mississippi, in April. All four have since been apprehended or found dead, officials said.

The Philadelphia escapees were identified as Nasir Grant, 24, and Ameen Hurst, 18. They escaped the Philadelphia Industrial Correctional Facility through a hole in a recreation yard fence around 8:30 p.m. Sunday, Carney said.

They were discovered missing around 3 p.m. Monday, she said, noting there were three headcounts in the interim - 11 p.m. Sunday and 3 a.m. and 7 a.m. Monday - during which their absence wasn't noticed.

Officials are trying to figure out why those three counts didn't discover the two missing men, Carney said.

"Clearly the system screwed up and people didn't do what they were supposed to do," Philadelphia Mayor Jim Kenney said during the news conference.