Meanwhile, Iraqi troops have driven out Islamic State militants from three more neighborhoods in the northern city of Mosul.
Hundreds of thousands of Iranians come to Iraq each year to visit holy Muslim shrines and attend religious ceremonies.
Police and hospital officials confirmed the toll and said another 45 people were wounded in the attack, which destroyed the station and set several cars on fire. "There are completely charred corpses at the scene", Falah al-Radhi, head of the provincial security committee, said.
The victims of Thursday's attack were returning after performing the Arbaeen in Kerbala, which commemorates the 40th day of mourning for the 7th century AD killing of Imam Hussein, a grandson of the Prophet Mohammad.
Qassemi said that Iran's Foreign Ministry and its embassy in Iraq are following the case carefully, and reiterated that ISÂ´ attack is an answer to the repeated defeats they have been given as part of the offensive staged by the Iraqi government to free Mosul.
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"These brutal and inhumane acts will not affect the Iraqi government and nation's determination and the Islamic Republic of Iran's support for the oppressed Iraqi people in the unrelenting fight against terrorism".
"The more Daesh (IS group) feels cornered on the frontlines, the more they may seek to avenge their losses with attacks against unarmed civilians", Kubis said.
The IS terrorist group frequently carried out such suicide attacks against Shiite pilgrims who perform communal rituals in Iraq, in an attempt to provoke sectarian strife in the violence-shattered country.
Many blame the current chronic instability, cycle of violence, and the emergence of extremist groups, such as the Islamic States, on the USA, which invaded and occupied Iraq in March 2003.