Pakistan's prime minister has reportedly telephoned the top British diplomat in the country, expressing fears that the army might be about to stage a coup.
Yousuf Reza Gilani this week asked High Commissioner Adam Thomson for Britain to support his embattled government, an official in Islamabad and a British official told the Associated Press.
It is unclear if the British government took any action.
Tensions between Pakistan's army and government have soared in recent days, leading to speculation that the army might stage a coup or support possible moves by the Supreme Court to oust the government.
Earlier, Pakistan's president returned from Dubai and his spokesman said he was not worried about the political crisis.
President Asif Ali Zardari went to Dubai on Thursday for a one-day personal trip.
He travelled last month to Dubai for medical reasons, triggering widely reported rumours he was on the verge of resigning.