Iran and the United States say they both carried out strikes on military targets, and each accused the other of acting aggressively as diplomatic efforts to end three months of war drag on.
The US military said it had at the weekend struck Iranian air defences, a ground control station and two drones that were threatening ships after "aggressive Iranian actions", including shooting down a US drone over international waters.
Iran's Islamic Revolutionary Guard Corps said on Monday it had targeted an air base used by the US in response to an attack on southern Iran.
