The terrorist group that claimed responsibility for the deadly suicide attack on the Marriott Hotel in the Pakistani capital has issued fresh warnings that it will carry out more strikes on American targets.

An SMS message sent to journalists in Islamabad [Images] late last night, said the Fidayeen-e-Islam would carry out more attacks on American targets.

It also rejected the Pentagon's statement that only two US Marines were killed in the bombing of the Marriott.

"Fidayeen-e-Islam rejects Pentagon's claim that only two US Marines were killed in the Marriott blast," said the message in English.

"In fact three top floors of Marriott were full of Marines, NATO high-ranking officials, European diplomats and FBI agents. Secondly, all those who will facilitate Americans and NATO crusaders like (Marriott owner Sadruddin) Hashwani, they will keep on receiving the blows," it said.

The hitherto unheard of Fidayeen-e-Islam had on Monday claimed responsibility for the September 20 bombing of the Marriot that killed over 50 people, including at least five foreigners, and injured 266.

The claim was made in a phone call to the Islamabad-based correspondent of Al-Arabiya channel by one Ahmad Shah Abdali.

Today's SMS also carried Abdali's name. A suicide bomber rammed a truck packed with 600 kg of high-grade explosives into the main gate of the five-star hotel killing 53 people, among them Czech Ambassador, two US Marines and a Danish intelligence official. Little or nothing is known about the group and Pakistani officials continue to suspect the hand of al-Qaeda or Taliban [Images] in the gruesome bombing.