(CNN) -- Iranians wounded during protests are being seized at hospitals by members of an Islamic militia, an Amnesty International official told CNN.

Amnesty International has collected accounts from people who have left Iran and expatriates with relatives there who say the Basij has prohibited medical professionals from getting identification information from wounded demonstrators who check in, Akhlaghi said on Saturday. They are also not allowed to ask how the injuries happened, and relatives are hard pressed to find the wounded.

Once the patients are treated, the militia removes them from the hospital to an undisclosed location, she said.