At least 59 people are dead and dozens injured after twin blasts hit a religious site in Damascus frequented by Shiite Muslims on Saturday, a monitoring group reported.
Iraq said that the dead included 40 of its citizens.
Some 120 other Iraqis were injured in the blasts close to the the Bab al-Saghir cemetery, near the centre of the Syrian capital.
The Syrian Observatory for Human Rights said that a roadside bomb went off near a cemetry. Shortly after, a suicide bomber blew himself up amid a crowd of Shiite visitors gathered at the site.
Syria’s state news agency SANA said both blasts had been caused by explosive devices.
Forty people were killed and around 120 injured in the explosions, the agency reported, quoting Syria's Interior Minister Mohamed al-Shaar.
Al-Shaar said "a committee was formed to investigate the bombings and find the criminals whose only goal is to kill."
While visiting some of those injured at a local hospital, the minister also promised tighter measures to prevent further attacks on citizens.
Footage on SANA showed the site of the attack stained with blood amid damaged parked buses.
So far, there has been no claim of responsibility.
Iraq, which borders Syria, said it was coordinating with Damascus on how to fly home the bodies of the Iraqis killed in the attack.
“The international community must condemn this terrorist crime that targeted Iraqi civilians visiting holy sites,” spokesman for the Iraqi Foreign Ministry, Ahmed Jamal, said in a statement.
Iraq is engaged in a US-backed campaign aimed at driving the Daesh extremist militia from its territory.
The radical Sunni organization and other militant groups are active in Syria.
Damascus has seen several attacks since the Syrian conflict started in March 2011.
In November last year, 20 people were killed in two suicide attacks in the mainly Shiite suburb of Sayeda Zeinab in southern Damascus. Daesh claimed that attack.
