A former police officer facing a prison term for his part in a pension fund scandal took the man who exposed the kickback scheme hostage on the 15th floor of an office building Saturday, police said.

A hostage-response team and dozens of officers surrounded the building where Anthony D. Daniele, 39, held John Frank, vice president of the city police board, police said."No demands. We're just talking," said Lt. Col. Calzona Hall at a briefing as the ordeal passed the 12-hour mark. "He's been very cooperative. The hostage is fine."

Police spokeswoman Linda Hancock said the hostage-response team was negotiating with Daniele, who was armed with a weapon that was not immediately identified and was demanding to make a statement over St. Louis radio station KMOX-AM.

The incident began at 10:30 a.m.

"We're extremely optimistic. Time is on our side," Hall said late Saturday. "It's been going on for 12 hours and nothing has happened," he said. "It's up to him to determine what he wants to do."

As the standoff entered its eighth hour, police Sgt. Kirwan Young said, "We're in the process of negotiating and talking to him, trying to find out what he wants us to do, what it would take to get him out of the building."

Daniele was one of six men who received prison sentences Friday from U.S. District Judge William L. Hungate. Daniele, in addition to an eight-year term, was ordered along with the scheme's purported mastermind to make restitution of $200,000.