Bangladesh's opposition leader, Sheikh Hasina Wajed, yesterday accused 'fundamentalist groups within the Bangladesh Nationalist Party-led ruling coalition' of triggering bomb blasts at four cinemas, which killed 20 people. 'It appears that fanatics and radical elements within the governing alliance are responsible for the heinous bomb blasts,' the former premier said without naming the two hardline Islamist parties in Prime Minister Begum Khaleda Zia's four-party coalition government. Begum Zia condemned Saturday's blasts as 'a calculated act of terrorism' but has not yet identified the perpetrators, although she said a judicial inquiry will be launched into the attacks. No group has so far claimed responsibility for the explosions in Mymenshingh, 150km north of Dhaka. Twenty people were killed and over 200 injured. Meanwhile, Bangladesh Interior Minister Altaf Hossain Chowdhury, has denied saying the blasts could be the work of Osama bin Laden's al-Qaeda network. His alleged remarks were lapped up by Bangladesh's Hindu neighbour, India, as proof of al-Qaeda's presence in Bangladesh. But Dhaka security experts have ruled out the involvement of al-Qaeda as all the cinema blast victims were Muslims celebrating Eid-al-Fitr - the end of Ramadan. Meanwhile, Sheikh Hasina described Sunday's arrest of her political secretary, Saber Hossain Chowdhury, as a 'staged drama' to malign her Awami League party. Officials in Dhaka have since said Chowdhury's arrest was not directly linked to the Mymenshingh blasts. The blasts have come close on the heels of India's accusations that its Muslim neighbour had become a haven for al-Qaeda and Taleban fighters. Quoting a senior government official in New Delhi, an Indian newspaper reported recently that bin Laden's deputy, Egyptian Ayman al-Zawahiri, was in hiding in Bangladesh. Dhaka immediately dismissed the allegation. Last month, the Bangladesh Foreign Ministry summoned the Indian High Commissioner in Dhaka several times to protest against the barrage of anti-Bangladesh statements by Deputy Prime Minister Lal Krishna Advani, Defence Minister George Fernandes and Foreign Minister Yashwant Sinha. 'Nobody is denying the existence of some radical Muslim groups here but nothing can be more preposterous than accusations that al-Qaeda has become very active in Bangladesh,' said retired major-general Syed Ibrahim of Dhaka's Centre for Strategic and Peace Studies. Bangladesh has seen several bomb attacks in recent years. In September, 30 people were wounded in blasts at a circus in southwestern Satkhira. At least 22 people were killed and more than 100 wounded in an explosion at an office of the then ruling Awami League party in June last year, and at least nine people were killed and 50 wounded in a blast during an open-air concert in 2000. But investigators have invariably drawn a blank, with the cases going unsolved.