Iran has frozen bank accounts belonging to a former Afghan warlord suspected of joining forces with Taleban and al-Qaeda militants, the UN says. The chairman of one of the UN's sanction committees says Iran has frozen "considerable assets" under the control of Gulbuddin Hekmatyar. His Hezb-e-Islami group is suspected of carrying out attacks on foreign and Afghan forces in Afghanistan.Iran has also apprehended a number of al-Qaeda operatives, Mr Munoz says. However, he did not give the names of those arrested or the amount of assets frozen. Mr Munoz, the chairman of the UN Security Council committee which monitors sanctions against al-Qaeda and the Taleban, was speaking at an open meeting of the council after visiting Iran and other countries. He said Iran also reported that commercial activities were being used to finance what he called terrorist activities. "We were told that an Iraqi had operated a company in Iran which sold spoiled vegetables to clients in another country in the area who, in return, paid unusually high prices to the supplier," Mr Munoz said, according to the Associated Press news agency.