BAGHDAD, Iraq — Two suicide bombers detonated explosives inside Baghdad’s main police academy Tuesday, killing at least 43 people and wounding more than 70, police said. Al-Qaida in Iraq claimed responsibility for the attack, the capital’s deadliest in months.

The bombing came as Al-Jazeera aired an insurgent video claiming to have kidnapped a U.S. security consultant — the seventh Westerner abducted in Iraq since Nov. 26 — and the U.S. military reported another American soldier killed in a roadside bombing in Baghdad.

Late Tuesday, another suicide bomber blew himself up in a cafe frequented by police in a Shiite neighborhood, killing three people and wounding 20, police said. One of the dead and three of the wounded were policemen, officials said.

The assault on the police academy was carefully planned to maximize casualties, all of whom were police officers or cadets.