( CNN ) -- An eight-hour hostage standoff ended late Wednesday when an armed , disabled man wheeled himself out of a Virginia post office and was taken into custody , according to the mayor of Wytheville . Initially , authorities reported five people -- three postal workers and two customers -- were taken hostage after a man entered a Wytheville , Virginia , post office about 2:30 p.m. and fired a gun . But Mayor Trent Crewe said police later believed the gunman was holding fewer than five people and that they have accounted for people they thought could have been inside . `` Apparently they ran as it was unfolding and we did n't know that for a while , '' Crewe said . An unidentified witness told CNN affiliate WDBJ that he , a fellow window clerk and the postmaster were in the building when the gunman entered , but they quickly fled . He added that his supervisor was one of the hostages . WDBJ reports on standoff . Crewe said he did not know exactly how many hostages had been in the building . No one was reported hurt , Crewe said . The gunman is disabled , Crewe said , adding that police told him the gunman entered the post office pushing a wheelchair . It was unclear what the purpose of the wheelchair is , Crewe said . There were reports the man had a `` device , '' and it appeared that his car , parked outside the office , was equipped with some type of device as well , Crewe said . He did not elaborate on what the device could be . `` The police authorities have told me they are acting on the assumption there is an explosive device of some kind in some location , '' Crewe said . `` There is a bomb squad , in fact more than one bomb squad on site , but we can not confirm any explosives . '' The surrounding area of downtown Wytheville has been evacuated within a three- to four-block radius , Crewe said . The suspect asked for pizza but made no other demands , U.S . Postal Inspection Service spokesman Peter Rendina said . The gunman 's motive was unclear , Crewe said . He had not identified himself but he has told police he has a military background , Crewe said . Police have yet to confirm whether the gunman has military training , Crewe said . Agents with the FBI and the Bureau of Alcohol , Tobacco , Firearms and Explosives were also on scene , Crewe said . Wytheville is a small town in southwestern Virginia in the foothills of the Blue Ridge Mountains . It has a population of just over 8,000 . CNN 's Shawn Nottingham contributed to this report .
Wednesday : Armed , disabled man wheeled himself out of a Virginia facility , taken into custody . Standoff : Wednesday afternoon ; number of hostages was uncertain . He entered Wytheville , Virginia , post office and fired a shot , mayor surrendered .