KARACHI The expected return of MQM to the PPP-led coalition hit a snag Monday as its leaders refused to meet Prime Minister Yousuf Raza Gilani and their chief Altaf Hussain asked the prime minister to step down if his government cannot stop 'massacre of Mohajirs. The party also announced a peaceful 'Mourning Day on Tuesday (today) across the country in protest against the killing of Mohajirs in Karachi and appealed to the nation to support mourning and condemnation day announced by the MQM, which largely represents Urdu speaking people whose ancestors migrated from India at the time of partition of Subcontinent and in the following years. In a message form London, MQM Chief Altaf Hussain asked the Prime Minister Yousuf Raza Gilani to step down if he could not get his orders implemented and was unable to get 'massacre of Mohajirs stopped. In a statement issued here, the MQM chief said: It is my brotherly advice to the prime minister to resign from his office if he is unable to bring peace to Karachi. Earlier, speaking during a news conference MQM Deputy Convener Farooq Sattar alleged that some PPP ministers were supporting terrorists in Karachi and no action was being taken against them. He said terrorists from the Peoples Aman Committee were sending extortion slips and those who refused to give money were being attacked. He said 'terrorists from the Aman Committee were targeting Mohajirs and were kidnapping, torturing and killing them. He demanded that the president and prime minister take notice of the killing of Mohajirs and take action against terrorists from the Peoples Aman Committee and those ministers who are supporting them. We want to make it very clear that if the government did not pay heed to the legitimate demands of the MQM and took no action against the killers, the MQM would be free to adopt its future course of action for the protection of the life and property of the citizens of Karachi, he warned. Sattar also appealed to the international community, national and international human rights organisations, civil society and intellectuals to take notice of the mayhem 'under the aegis of the government. Sources privy to the situation informed that the MQM would announce its future course of action today.