The truce is under strain because of two issues, Lebanon and the Strait of Hormuz. U.S. and Iranian negotiators are scheduled to meet in Pakistan this weekend.
The U.K. government underlined its previous stance that the United States could only use British bases for defensive purposes, after President Trump threatened to strike civilian targets.
President Trump has threatened devastating attacks if Iran does not reopen the Strait of Hormuz. Some Iranians questioned what had happened to American values.
Rescue workers recovered four bodies from a residential building in the port city of Haifa after air defenses failed to intercept an Iranian strike, Israeli officials said.
An Iranian intelligence chief killed overnight on Monday was one of several Iranian officials who occupied their posts for only a few months.
Global leaders are struggling in their efforts to find a way to end the American-Israeli war on Iran, and they are spooked about what President Trump might do next.
In an expletive-filled social media post, Mr. Trump said Iran should open the Strait of Hormuz or he will bomb bridges and power plants.
After Iran shot down a U.S. plane and U.S. forces pulled off a risky ground operation to extricate a stranded airman, both sides claimed victory. That confidence could fuel further escalation.
Ronald Young Jr. was in the Army when his Apache Longbow copter went down during the U.S. invasion of Iraq.
One crew member was rescued. The risky operation to find the second airman came as the United States and Israel struck infrastructure targets in Iran, prompting Iranian retaliation in the Gulf.