A suicide bomber has attacked the Saudi city of Medina, close to the Prophet’s Mosque, one of Islam’s holiest sites, according to local media reports.
The bomber detonated his device as security officers were breaking their Ramadan fast, al-Arabiya TV said.
News outlets said at least two of the officers had been killed, but there has been no official confirmation.
The mosque is the burial place of the Prophet Muhammad and Medina the second-holiest city in Islam after Mecca.
State-linked Sabq news and the Okaz newspaper also carried reports of the suicide attack.
Earlier, at least one explosion rocked the eastern city of Qatif.
Qatif is home to many minority Shia Muslims and the blast appeared to target a Shia mosque. The attacker was killed but no other casualties were reported.
A suspected suicide bomber also died after detonating a device near the US consulate in the city of Jeddah. Two security officers were slightly injured as they tackled the man, but no-one else was hurt.