Any conflict in the Gulf region may spread uncontrollably, a senior Iranian military commander was cited as saying on Sunday, by the semi-official news agency Fars.
"If a conflict breaks out in the region, no country would be able to manage its scope and timing," Major General Gholamali Rashid said. "The American government must act responsibly to protect the lives of American troops by avoiding misconduct in the region."
U.S. President Donald Trump said on Friday he aborted a military strike to retaliate for Iran's downing of a drone because it could have killed 150 people, and signaled he was open to talks with Tehran.
Earlier Sunday, Iranian lawmakers chanted "Death to America" during a parliament session after a speaker accused the United States of being the "real world terrorist", amid escalating tension with Washington following the downing of an unmanned U.S. drone.
Iran said on Saturday it would respond firmly to any threat against it.
"America is the real terrorist in the world by spreading chaos in countries, giving advanced weapons to terrorist groups, causing insecurity, and still it says 'Come, let's negotiate'," the parliament's deputy speaker, Masoud Pezeshkian, said at the start of a session broadcast live on state radio.
"Death to America," chanted many lawmakers.
The chants, often repeated since the 1979 Islamic revolution which toppled the U.S.-backed Shah, came weeks after Trump said in a U.S. television interview: "They (Iranians) haven't screamed 'death to America' lately."