Iran on Sunday warned of military action and called US President Donald Trump a “terrorist in a suit” after he threatened “very fast and very hard” reprisals against any attack on American people or assets in the aftermath of the killing of top military commander Qassem Soleimani, who headed the Islamic Revolutionary Guard Corps.

Late on Sunday, Iran’s state television reported that the country will no longer abide by any of the limits of its 2015 nuclear deal. State TV cited a statement by Iranian President Hassan Rouhani’s administration saying the country will not observe limitations on its enrichment, the amount of stockpiled enriched uranium as well as research and development in its nuclear activities.

Trump, who is holidaying in his private resort in Mara-a-Lago, Florida, earlier said the US military has 52 Iranian targets in its crosshairs, responding reportedly to intelligence that Iranian ballistic missile units were in a heightened state of alert.

Secretary of state Mike Pompeo said Sunday the US will strike lawful targets, pushing back against criticism that the United States will be targeting Iranian cultural assets, which are protected by an international agreement. The targets are “designed with a singular mission defending and protecting America”, he added.

The United States killed Soleimani, a leader of an Iran-backed Iraqi militia and five other men in a drone strike outside the international airport in Baghdad on Friday. Soleimani is considered the architect of Tehran’s clandestine and military operations abroad. The attack took long-running hostilities between Washington and Tehran into uncharted territory, and raised the spectre of wider conflict in West Asia. Soleimani was planning “imminent and sinister” attacks on Americans and their military facilities, the US has said. Iranians, their allies and their proxies have responded with expected outrage and have vowed to avenge Soleimani’s assassination. Iranian supreme leader Ayatollah Ali Khamenei promised on Friday that his country would seek harsh revenge. And President Hassan Rouhani assured the general’s relatives “everyone” will step up to it.

On Sunday, hundreds of thousands of mourners, many chanting, beating their chests and wailing in grief, turned out across Iran to show their respects after Soleimani’s body was returned home to a hero’s welcome.

US secretary of state Pompeo said if there were further Iranian attacks on US targets, Washington would respond with lawful strikes against decision-makers orchestrating such attacks.

He also admitted to the possibility that Iran could try to attack American troops. “We think there is a real likelihood Iran will make a mistake and make a decision to go after some of our forces, military forces in Iraq or soldiers in north-east Syria,” he told Fox News in remarks aired on Sunday. His remarks and Trump’s tweets came against the backdrop of a New York Times report that US intelligence had detected Iranian ballistic missile units in heightened state of alert. The report also said some officials believed it was unclear if the Iranians were dispersing them in anticipation of an American attack or they were being mobilised for a strike against the US.