The US has said it struck Iranian military sites over the weekend while Tehran said it responded by targeting a US base, marking the third known escalations in a week around the Strait of Hormuz. US Central Command (Centcom) said it launched "self-defence strikes" in response to "aggressive Iranian actions", which it said included a US drone being shot down over international waters. Iran's Islamic Revolutionary Guard Corps (IRGC) meanwhile said it had targeted an air base used by US forces for an attack on southern Iran, but did not say where.