Here are some reactions to the killing of Qassem Soleimani, head of Iran's elite Quds Force, in a US air strike on his convoy at Baghdad airport.
Iranian Supreme Leader Ayatollah Ali Khamenei:
"All enemies should know that the jihad of resistance will continue with a doubled motivation, and a definite victory awaits the fighters in the holy war," Khamenei said in a statement carried by TV. Iran often refers to regional countries and forces opposed to Israel and the United States as a "resistance" front.
In a statement later, cited by state media, Khamenei appointed the deputy commander of the Quds Force, Brigadier General Esmail Ghaani, to head the force and said the force "will be unchanged from the time of his predecessor."
Iranian President Hassan Rouhani:
"Soleimani's martyrdom will make Iran more decisive to resist America's expansionism and to defend our Islamic values," Rouhani said in a statement.
"With no doubt, Iran and other freedom-seeking countries in the region will take his revenge."
Iranian Foreign Minister Mohammad Javad Zarif:
"The brutality and stupidity of American terrorist forces in assassinating Commander Soleimani... will undoubtedly make the tree of resistance in the region and the world more prosperous," Zarif said in a statement.
On Twitter he called the killing "an extremely dangerous and foolish escalation."
Iraqi Prime Minister Adel Abdul Mahdi
The air strike on Baghdad airport is an act of aggression on Iraq and a breach of its sovereignty that will lead to war in Iraq, the region, and the world, Abdul Mahdi said in a statement.
The strike also violated the conditions of US military presence in Iraq and should be met with legislation that safeguards Iraq's security and sovereignty, he added.
Nancy Pelosi, democratic speaker of US house of representatives
"Tonight’s airstrike risks provoking further dangerous escalation of violence. America – and the world – cannot afford to have tensions escalate to the point of no return."
"The Administration has conducted tonight’s strikes in Iraq without an Authorization for Use of Military Force (AUMF) against Iran. Further, this action was taken without the consultation of the Congress."
Former US vice president Joe Biden:
"This is a hugely escalatory move in an already dangerous region. President Trump just tossed a stick of dynamite into a tinderbox, and he owes the American people an explanation of the strategy and plan to keep safe our troops and embassy personnel, our people and our interests, both here at home and abroad, and our partners throughout the region and beyond."
US Senator Elizabeth Warren:
"Soleimani was a murderer, responsible for the deaths of thousands, including hundreds of Americans. But this reckless move escalates the situation with Iran and increases the likelihood of more deaths and new Middle East conflict. Our priority must be to avoid another costly war."
British Foreign Minister Dominic Raab:
"We have always recognized the aggressive threat posed by the Iranian Quds force led by Qasem Soleimani. Following his death, we urge all parties to de-escalate. Further conflict is in none of our interests," he said in an emailed statement.