Iran declares day of mourning on Thursday after blasts kill 103

"Following the terrorist incident in Kerman, the government declared tomorrow (Thursday) a day for public mourning across the country," state television announced on Wednesday.

At least 103 people were killed in Iran Wednesday as two bombs in quick succession struck a crowd commemorating slain general Qasem Soleimani on the anniversary of his killing, state media reported.

The blasts, which state television called a "terrorist attack", came with tensions running high in the Middle East a day after Hamas number two Saleh al-Aruri -- an Iran ally -- was killed in a drone attack on a Beirut southern suburb which Lebanese officials blamed on Israel.

The blasts stuck near the Saheb al-Zaman Mosque in Kerman, Soleimani's southern hometown where he is buried, as supporters gathered to mark the fourth anniversary of his killing in a US drone strike just outside Baghdad airport.

Kerman's deputy governor, Rahman Jalali, said the explosions were a "terrorist attack".

There was no immediate claim of responsibility for the attack.