Pittsburgh police and the city's Office of Municipal Investigations are looking into allegations of misbehavior by officers at Mayor Luke Ravenstahl's election night party at a North Shore sports bar.

Deputy Chief Paul Donaldson confirmed the probes but refused to divulge details about a complaint that was made or who it targeted.

"There are allegations made against a number of officers during the event and it's being investigated internally," Deputy Chief Donaldson said yesterday.

The allegations focus partly on friction between members of the mayor's personal security detail and other officers who were providing security for the Nov. 3 event under the direction of Zone 2 Cmdr. George Trosky, according to sources familiar with the investigation.

Questions also have been raised about whether any on-duty officers were drinking during the festivities at Mullen's Bar & Grill on Federal Street, sources said.

Cmdr. Trosky said he saw nothing amiss.

"I haven't been and none of my guys have been notified of any investigation," Cmdr. Trosky said.

Fraternal Order of Police President Dan O'Hara was at the party all night and said he was unaware of any problems or who was under investigation.

"Was I there? Absolutely. Did I see anything? No," Officer O'Hara said. "You would have thought someone would have brought it to my attention -- 'Hey, can you resolve it?' I never heard a single thing."

Officer O'Hara said he was limited in what he could discuss because he might be pulled in as a witness since he was at Mullen's.

Another aspect of the investigation is whether the officers under Cmdr. Trosky's jurisdiction were on duty or off duty, and who should pay for their services -- taxpayers or the mayor's campaign.

"This is all on-duty guys," Cmdr. Trosky said last evening. "I got a good crew of guys. This was all on-duty and all on the up and up."

However, OMI Director Kathy Kraus said personnel records indicate otherwise. She said a check of the officers' "roster cards" showed that they were marked as having used "discretionary time" on the night of the mayor's election party, meaning that they were off duty.

Ms. Kraus would not comment on any other aspect of the situation.

While Mr. Ravenstahl has his own bodyguards who are Pittsburgh police officers, Cmdr. Trosky said he has been in charge of providing security for any special mayoral events since he was promoted to commander in 2007.

Cmdr. Trosky said he was concerned about possible disruptions at the mayor's post-election gala following the G-20 summit and the arrest of protesters at Allegheny County Executive Dan Onorato's announcement of his candidacy for governor last month.

He said he assembled the officers from his station's on-duty ranks -- three undercover officers, a uniformed desk officer and one other officer whom he could not recall -- and had them work at the mayor's party. Cmdr. Trosky was also on duty.

"No overtime was hired and I didn't take uniform car guys. I had my undercover guys. There was no overtime. The station was staffed fully. This goes on all the time, not just for the mayor but for special events, be it a football game, hockey game, they pull people from the districts. This is nothing new," Cmdr. Trosky said.

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