Sources said a team of the joint forces has visited the stock exchange recently to enquire about Salman, the detained vice-chairman of Beximco Group and leader of Awami League (AL).

"We have requested them [joint forces] to come with official or written documents so that we can ask the brokerage houses to provide information on his investment," said a high official of the DSE.

Also an adviser to AL President Sheikh Hasina, Salman was held on February 4 as part of a move against the political bigwigs accused of corruption. He was sent to jail the following day.

Meanwhile, the joint forces have also requested the Office of the Registrar of Joint Stock Companies to release documents pertaining to the 12 companies of former BNP lawmaker Mosaddek Ali Falu, who too was detained on February 4, said sources.

The companies he owns include television channels ntv and RTV, Amardesh Publications Ltd, Brotherhood Enterprise Ltd, Brotherhood Securities Ltd, Buildtrade Structures Ltd, Buildtrade Engineers Ltd, Dhaka-Shanghai Ceramics Ltd, MB Agroproducts Ltd, Daiper Ltd, IFIC Bank and Sahabuddin Medical College Hospital.