Security in Pakistan's capital Islamabad was stepped up visibly on Sunday ahead of peace talks between the United States and Iran in the coming days.

President Donald Trump said US negotiators will be in Pakistan on Monday to resume talks on ending the war with Iran, little more than a week after face-to-face talks in Islamabad on April 11 ended without agreement.

"My Representatives are going to Islamabad, Pakistan — They will be there tomorrow evening, for Negotiations," he wrote on Truth Social.

Authorities earlier announced road closures and traffic restrictions across the city, as well as in neighbouring Rawalpindi.

AFP journalists saw armed guards and checkpoints near Islamabad's most secure hotels, including the Marriott and the Serena, where the last round of talks between US and Iranian delegations took place.

Most streets leading to the Serena Hotel were closed on Sunday, with barbed wire, barricades, heavy security and traffic diversions.

"Citizens are earnestly requested to cooperate with the security agencies," a city official posted on X.