The US army in Afghanistan has burned Bibles printed in local languages, a US colonel in Afghanistan has said, amid concerns they could have been used to try to convert Afghans.

"My understanding is that the [military] leadership confiscated these Bibles so that they could not be distributed around Afghanistan," Colonel Greg Julian told Al Jazeera on Wednesday.

"It was their best judgement at the time, that the best way to deal with it, was to destroy them and I understand that they were burnt."

Al Jazeera broadcast footage earlier this month showing troops apparently discussing how best to convert Afghans to their faith.

'Hunt them down'

Some of the soldiers who appeared in the video have been reprimanded, US government and military officials told Al Jazeera correspondent James Bays.