TEHRAN: An assailant stabbed three clerics at the most revered Shiite site in Iran on Tuesday, according to Iranian state-run media, killing one and injuring two before he was arrested. The motive for the attack remained unclear. 
One cleric died almost instantly after being stabbed at the Imam Reza shrine, a major pilgrimage site for Shiite Muslims in Iran’s northeast city of Mashhad. Two others were hospitalized, Iran’s state-run IRNA news agency reported. 
State media identified the cleric who was killed as Mohammad Aslani. It did not provide information about the conditions of the other victims or identify the suspect. 
In a video from the scene that was shared on social media, two men could be seen splayed on the shrine’s gray marbled floor covered with blood. IRNA news agency posted a video of police arresting the assailant. 
The attack happened on the third day of the holy fasting month of Ramadan that draws Muslim worshippers to communal prayers at mosques across the country. 
The Imam Reza shrine in Mashhad, some 900 kilometers (560 miles) northeast of the capital Tehran, is the largest complex housing a tomb in Iran and its most visited. The shrine draws about 20 million people a year, mostly Iranians and pilgrims from neighboring nations like Iraq and Pakistan. 
Such violent acts at the holy shrine are rare. However, one of the biggest terrorist attacks in Iranian history occurred at the shrine in 1994. At the time, the government held an armed opposition group, Mujahedeen-e-Khalq, responsible for the bombing that killed over two dozen people. 
The stabbings on Tuesday followed a separate attack targeting clerics earlier this week. On Sunday, two Sunni clerics were shot to death in a mosque in the northern town of Gonbad Kavus. Authorities did not offer a motive for that incident, either.