An armed man who took a hostage inside a downtown Pittsburgh office building has surrendered to police.

Police Chief Nate Harper says the suspect gave himself up after posting Facebook updates in the early hours of the standoff saying he had "lost everything." Harper says the hostage is OK.

Police identified the hostage-taker as Klein Michael Thaxton. Harper had said Thaxton had a military background and was suicidal.

The standoff began Friday morning inside the 16th-floor office of a benefits administration firm.

Harper says Thaxton was cooperative but made no demands.

Thaxton's friends had responded to his Facebook posts by urging him to end the situation peacefully, including one who asked him to think of his mother.

The Facebook page was later taken down.

FROM WTOV: After more than a five-hour standoff at Pittsburgh's Gateway Center, a man surrendered peacefully just before 2 p.m. and released his hostage.

It's unclear who shut it down and why, but Thaxton's Facebook page was shut down, so he won't be making any more posts from the scene. You can read some of his posts here.

Negotiations between police and the suspect have surpassed five hours in downtown Pittsburgh.

One friend recently posted this message to him: "Boogie we love you, watevers qoin on you can qet throuqh this .. i love you cuzzo stay stronq"

Media and those following the events unfold are attempting to "friend" the suspect on Facebook. Sending such a request, however, yields the following message: "Sorry this user already has too many friend requests."

Note: WPXI-TV has made the decision to take down our livestream coverage of the hostage situation at Gateway Center. We will continue to update you on all of the latest developments and resume the livestream once there are no more safety concerns.

Police Chief Nate Harper, speaking with reporters, discusses the Facebook communication between the suspect and other Facebook users. He says, "It is showing the people are concerned about his well being, it is beneficial."

People evacuated by Pittsburgh Police from the Gateway Three office building wait outside as the police negotiate with a man who claims to have a bomb in a suite in the sixteenth floor, in downtown Pittsburgh Friday, Sept. 21, 2012. A call about an armed man inside the building prompted the evacuation amid reports of a hostage situation. (AP Photo/Keith Srakocic)

Check out all of the latest information on who Klein Michael Thaxton is and what we know about his background by clicking here.

Sources said the man pulled out the gun around 8:20 a.m. A security guard told Target 11 investigator Rick Earle that he overheard a female say, "Don’t come in here. You will get hurt." The guard said he then called police.

Police believe that the hostage may be the owner of CW Breitsman Associates.

Thaxton has posted another Facebook update as police attempt to talk him down. Take a look at the comments.

That's a quote from Pittsburgh Police Chief Nate Harper, according to CBS.

CNN reports that the suspect's mother is on the scene and hoping to talk some sense into her son.

Update: suspect just identified as Cline Michael Thaxton.Still inside 16th floor of Three Gateway with hostage

— Michelle Wright (@tvmichelle) September 21, 2012

The suspect does have a criminal record, according to authorities. He also claims to have a gun, knife, and explosives, Chief Harper said.

Police say that the suspect has no demands at this time.