Pakistani authorities have announced a crackdown against Hafiz Saeed, the leader of the group blamed for deadly attacks on Mumbai in 2008, amid growing international pressure to act against militant groups.

Pakistan’s counter-terrorism department said on Wednesday that it had launched 23 cases against Saeed and 12 aides for using five trusts to collect funds and donations for Lashkar-e-Taiba (LeT), blamed by India and the US for the attacks in Mumbai that killed 166 people.

Two banned LeT-linked charities, Jamaat-ud-Dawa (JuD) and Falah-i-Insaniat Foundation (FIF), were also targeted, the department said in a statement.

“All the assets of these organisations and individuals will be frozen and taken over by the state,” said a counter-terrorism senior official, speaking on condition of anonymity because he was not authorised to speak publicly.

The counter-terrorism department said the action was in accordance with UN sanctions against the individuals and entities.

The move follows pressure from the Financial Action Task Force (FATF), which last year placed Pakistan on its “grey list” of countries with inadequate controls over money laundering and terrorism financing.

Last month the international watchdog gave Pakistan an October deadline to improve its efforts against terrorism financing. The FATF has said Pakistan could end up on the blacklist when it reviews progress in a meeting later this year.

Saeed, designated a global terrorist by both the UN and the US, is one of the founders of LeT, or the Army of the Pure. The US, which has pressured Pakistan to crack down on militant groups, has offered a $10m (£8m) reward for evidence leading to his conviction.

LeT has been banned in Pakistan since 2002 and the charities since last year. Saeed, who denies involvement in violence or funding militants, has been freed by Pakistani courts after being detained at his home several times in the past.

Pakistan has long faced international pressure to shut off financing to militant groups operating from its soil and has repeatedly pledged action, but results have been patchy and have failed to satisfy critics.

Pakistan has long denied accusations from Washington, New Delhi and others that it nurtures and supports Islamist militants in line with foreign policy goals in neighbouring Afghanistan and the disputed Kashmir region.