A man claiming to have a bomb in a canvas bag took at least one person hostage Friday in an office building in the US city of Pittsburgh, authorities said.
"There's a hostage situation at Three Gateway Center," said Kelly Kochamba, an FBI spokeswoman, naming the building in a downtown office complex. "There's at least one woman, I don't know if there's any more than one."
The assailant claimed to have a bomb, "but there is no evidence at this time," Kochamba said.
Pittsburgh Police Chief Nate Harper, meanwhile, told reporters at the scene that a man with a criminal record was holding two people on the sixteenth floor of the highrise.
The man has a criminal record but is "not irrational," he said.
"I wish I could say I'm very confident but it's up to the individual and right now we don't know," he said, adding that no demands have been made and that "no one knows what he wants."
The alleged hostage-taker's mother was called to the scene to help resolve the situation, according to CNN.