âWent out with a total of six inmates, and went back with five, and no one noticed anything wrong,ââ said the official, who requested anonymity to speak candidly about a continuing investigation. âNobody saw it. This is simply staff negligence.â
Peter Thorne, a spokesman for the Correction Department, said that around 7:30 p.m. on Wednesday officers discovered that an inmate did not return from outdoor recreation.
Mr. Hill has at least six burglary arrests since 2010, the most recent on May 15, according to police records. He has served more than four years in state prison on burglary charges and was released last year, according to state prison records.
Officials put the complex on âred alert,â the highest emergency level, meaning there was evidence that an escape had occurred.
Escapes in which an inmate makes it off the island are rare. Each jail is surrounded by walls and razor wire, with electronic gates controlled by officers.
âA red alert is a rarity, and it happens when you have the high likelihood of an escape,â said Mark Cranston, a former Correction Department commissioner who spent 25 years working at Rikers.
A red alert would prompt a mobilization of the islandâs special operations units, including bloodhounds, Mr. Cranston said. Officers would move immediately to seal off the perimeter.
Mr. Cranston said that he could recall only several occasions during his tenure when inmates were able to escape from the island. One inmate sneaked out by holding on to the bottom of a bus that left the island; another was able to escape in a garbage truck, he said.
It would be almost impossible for an inmate to swim for the mainland because of the strong currents in the East River, Mr. Cranston said.
An earlier version of this article misspelled part of the name of one of the nine working jails at Rikers Island. It is the Anna M. Kross Center, not Cross.