A suicide bombing outside one of Islam's holiest sites has killed four Saudi security officers and wounded five others.
Similar attacks on Monday targeting US diplomats in Jeddah and Shi'ite worshippers in Qatif followed days of mass killings claimed by the Islamic State group in Turkey, Bangladesh and Iraq.
The attack happened outside the mosque grounds where the Prophet Muhammad is buried in Medina. Millions of Muslims from around the world visit the mosque every year as part of their pilgrimage to Mecca.
The attacks appear to have been timed to coincide with the approach of Eid al-Fitr, the holiday that celebrates the end of the Islamic holy month.
A suicide bomber was killed and two others wounded in a blast outside the US consulate in Saudi Arabian city of Jeddah early on Monday, state TV said.
The attacker reportedly parked his car outside a mosque opposite the consulate before detonating his device, killing him and lightly wounding two security men nearby.
The US State Department said it is working with Saudi authorities to collect more information.
The spokesman confirmed that "all personnel under chief of mission authority are accounted for at this time".
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Bahrain has joined Saudi Arabia in halting flights to and from Iran, according to Saudi-owned Arabiya TV and Bahrain News Agency.
Bahrain announced on Monday it was cutting diplomatic ties with Iran a day after its ally and neighbour Saudi Arabia also severed relations.
Saudi Arabia also announced it was stopping flights to and from Iran, after its embassy in Tehran was stormed in response to its execution of the prominent Shi'ite cleric Sheikh Nimr al-Nimr.
Kuwait has recalled its ambassador to Iran over attacks on Saudi diplomatic missions in the Islamic Republic, the state-run Kuwait News Agency reported on Tuesday.
Saudi Arabia, Bahrain and Sudan all severed diplomatic ties with Iran on Monday amid a political row following the execution of a leading Shia cleric.
The UAE has downgraded its diplomatic team in Iran.
Saudi Arabia's decision to break off diplomatic relations with Iran was "deeply worrying", the United Nations Secretary General has said.
A spokesman for Ban Ki-Moon said that the UN chief had spoken with Saudi's foreign minister via phone.
UN spokesman Stephane Dujarric told reporters:
"The Secretary-General reiterated that the attack on the Saudi embassy in Tehran was deplorable, but added that the announcement of a break in Saudi diplomatic relations with Tehran was deeply worrying."
Iran has no right to interfere with the affairs of other nations like Saudi Arabia, a senior minister from Bahrain has told ITV News.
Bahrain's under-secretary for foreign affairs Abdulla Abdullatif Abdulla said that Saudi Arabia's actions were their "sovereign right" to protect its citizens from "terrorists."
Mr Abdulla Abdullatif also said that his country's decision to sever diplomatic ties with Iran was down to Iran's "interference in the Kingdom of Bahrain."
Watch the full interview on ITV News at 6pm.