The Medina suicide bomber has been identified as 18-year-old Umer Abdul Hadi, Arab media reported.
Abdul Hadi had been declared a proclaimed terrorist by Saudi security forces, media reports said.
Meanwhile, a Pakistani taxi driver has been blamed by Saudi Interior ministry for the suicide attack on the US consulate in Jeddah.
According to Saudi officials, the bomber was identified as Abdullah Gulzar Khan who moved to the Kingdom 12 years ago and was staying with his wife and in-laws in Jeddah.
Pakistan ambassador to Saudi Arabi has not confirmed the Saudi claim. “Information about Abdullah Gulzar is still being collected,” he said.
At least four security personnel were killed and five injured when suicide bombers struck three cities across Saudi Arabia on Monday, in an apparently coordinated campaign of attacks as Saudis prepared to break their fast on the penultimate day of the holy month of Ramadan.
Attacks in Jeddah, Qatif, Medina
A suicide bomber detonated a bomb at a parking lot outside the Prophet´s Mosque in Medina, the second-holiest site in Islam, a Saudi security spokesman told state news agency SPA.
“Security men noticed a suspicious person among those approaching the Prophet´s Mosque in an open area used as parking lots for visitors´ cars. As they confronted him, he blew himself up with an explosive belt, which resulted in his death and the martyrdom of four of the security men,” the spokesman said.
Five other officers were wounded, the statement added.
In Qatif, an eastern city that is home to many members of the Shi´ite minority, at least one and possibly two explosions struck near a Shi´ite mosque.
Witnesses described body parts, apparently of a suicide bomber, in the aftermath.
A resident of the city reached by telephone said there were believed to be no casualties there apart from the attacker, as worshippers had already gone home to break their fasts.
The third attack in Jeddah occured near the US consulate. A Saudi security official said an attacker parked a car near the US consulate in Jeddah before detonating the device.
The explosions targeting US diplomats, Shi´ite worshippers and a security headquarters at a mosque in the holy city of Medina followed days of mass killings claimed by the Islamic State group in Turkey, Bangladesh and Iraq.
The attacks all seem to have been timed to coincide with the approach of Eid-ul-Fitr