Prague - The Czech government Sunday condemned "the terrorist attack" on a five-star hotel in Islamabad which killed more than 50 people, including the Czech ambassador.

"The Czech Republic sharply condemns any type of terrorist activities," Czech Prime Minister Mirek Topolanek said in a statement.

Czech Ambassador to Pakistan, Ivo Zdarek, was identified as one of the victims of Saturday's suicide bombing that left at least 53 dead and many more injured, Pakistani and Czech officials confirmed.

The 47-year-old diplomat had stayed in the Marriott temporarily because his residence was undergoing refurbishment and a security upgrade, said Zuzana Opletalova, a spokeswoman for the Czech Foreign Ministry.

Brussels - The North Atlantic Treaty Organization on Sunday condemned the bomb attack that killed more than 50 people in a hotel in Islamabad, calling the act "grotesque."

Speaking for the military alliance, NATO General Secretary Jaap de Hoop Scheffer said: "I condemn in the strongest possible terms the terrorist bombing of the Marriott Hotel in Islamabad."

Berlin - German Chancellor Angela Merkel condemned on the Sunday the "brutal, inhumane" bombing that killed at least 53 people the day before in Islamabad.

"The fight against transnational terrorism remains a top priority for affected countries like Pakistan and the international community," she said in a Berlin statement.

"Germany will be continuing to support its partner Pakistan in efforts for stability and prosperity."

Germany's Foreign Minister Frank-Walter Steinmeier said in a condolence message to the Pakistan Foreign Ministry that everything must be done to "discourage support for the terrorists."

Tehran - Iran on Sunday condemned the bomb attack on a hotel in the Pakistani capital Islamabad, calling it a "terrorist act," ISNA news agency reported.

Islamabad - Rescuers found more bodies from the gutted Marriott Hotel in the Pakistani capital Sunday, increasing the official death toll to 53 in one of the country's worst suicide bombings, officials said.

A raging fire that completely destroyed the six-storey building held back rescuers through the night, before they could conduct room- to-room searches for survivors or victims.

Pakistani Prime Minister Yousaf Raza Gilani put the official death toll at 53, as rescue personnel searched through the charred remains of the hotel.

New Delhi - Indian Prime Minister Manmohan Singh on Sunday expressed deep shock and sorrow over the bomb attack in Islamabad in a letter to his Pakistan counterpart Yousef Raza Gilani.

Singh said India strongly condemned the act of terrorism and said the attacks were a grim reminder of the challenges posed by "destructive forces" which had pitted themselves against the values of democracy, pluralism and the voices of moderation.