Baghdad, Iraq (CNN) -- Sixteen people were killed and dozens were injured when two buses collided in Iraq, officials said Friday.
Most of the victims were Iranian pilgrims, Iraq's Interior Ministry said.
The two buses were headed to the holy Shiite city of Najaf from Baghdad, officials said.
Najaf, a city south of Baghdad, is a major center of pilgrimage for Shiites.
Since the end of the Saddam Hussein regime, an increasing number of Shiite pilgrims have traveled from Iran to visit the shrine of Imam Ali, the cousin and son-in-law of the Prophet Mohammed.
CNN's Mohammed Tawfeeq contributed to this report.