Earlier this week, the IRGC claimed it struck a US early warning radar system in Bahrain on Friday.
Iran launched drones toward a US military base in Bahrain on Sunday, its second attempt to target the country in three days. The US military said both were shot down.
The US military denied the claim. It said the IRGC launched two one-way attack drones toward Bahrain and that US forces shot both of them down.
Bahrain's military said its air defence systems intercepted and destroyed the Iranian air attacks"before they could achieve their objectives".
Sirens sounded across Bahrain on Sunday as the alerts went out. The interior ministry called on citizens to head to the nearest safe location.
Sunday's launch followed an Iranian drone attack on Bahrain on Friday, Iran's first strike against Gulf countries since September.
The IRGC did not comment on the Sunday attack. It said its forces had shot down two US MQM-170 drones south of the island and a US MQ-9 drone east of the Strait.
Iranian state news agency IRNA reported explosions on Qeshm on Monday.
Reported attacks on ships near the Strait of Hormuz have hit a record high, adding pressure around the waterway at the centre of the stand-off.