Explosions have been reported in Doha, Kuwait, Abu Dhabi and Manama, officials and news outlets said.
This comes after the US and Israel jointly struck Iran, with the IRGC saying the first wave of retaliatory missile and drone attacks has been launched.
A Qatari official said Qatar has intercepted two Iranian missiles over its country.
A centre for the US Fifth Fleet headquarters in Bahrain has been hit in a “missile attack”, Bahrain said.