Story highlights Two officers released hours after they are taken hostage

Incident leads to hostage standoff in the Delaware prison

(CNN) Two Delaware prison employees were still being held hostage on Wednesday night as authorities communicated with inmates, officials said.

Two other staff members from the James T. Vaughn Correctional Center in Smyrna were freed, according to Perry Phelps, the state corrections commissioner.

The incident unfolded shortly after 10:30 a.m. when a corrections officer radioed for assistance with a major disturbance involving staff in one building that housed more than 100 inmates, authorities said. Officers responded and four corrections employees were taken hostage.

The facility was quickly put on lockdown, authorities said.

"It's been a long and difficult day," Gov. John Carney said.

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