A man claiming to have a bomb walked into Hillary Rodham Clinton's storefront campaign office Friday and took at least two hostages, police and witnesses said.

The man ordered hostages to the ground and released a mother and her baby according to an officer on the scene.

Witness Lettie Tzizik told television station WMUR of Manchester that she spoke to the woman shortly after she was released and that she was crying, holding the infant.

She said, 'You need to call 911. A man has just walked into the Clinton office, opened his coat and showed us a bomb strapped to his chest with duct tape, Tzizik said.

Clinton was not in New Hampshire Friday. She was scheduled to give an address at the Democratic National Committee meeting in Vienna, Va., Friday afternoon, but Howard Dean announced from the podium that Clinton would not speak.

Authorities were sending a tactical bomb unit to assist local police, and the area was evacuated, Hambrook said. Authorities were trying to negotiate with the suspect, he said.

Workers for Sen. Barack Obama's campaign office also evacuated, a campaign spokesman said. The office is four doors away from Clinton's.