A roadside bomb in Afghanistan killed five people Monday and injured two, including a pregnant woman, when it ripped through the ambulance rushing them to hospital for her to give birth, police said.

The woman was wounded but survived and gave birth without any complications, but four relatives died along with the driver, Sari Pul provincial deputy police chief Sayed Jahnagir Kramat told AFP.

The interior ministry in Kabul initially said that the pregnant woman died in the blast in the northern province, which is regularly hit by insurgent activity, but later said it had been misinformed.

"She's alive and gave birth to her baby," Kramat told AFP.

[Ambulance. AFP Photo]