VIENNA, VIRGINIA -- Two campaign workers are being held hostage at Sen. Hillary Clinton's Rochester, New Hampshire campaign headquarters by a man with a bomb strapped to his chest, WMUR TV reports. The office is surrounded by police, who are negotiating with a suspect.

Clinton, in the Washington area to address the Democratic National Committee's winter meetings, has canceled her speech. Barack Obama's campaign also has an office in Rochester. It too has been evacuated, WMUR said.