The official news agency, IRNA, reported Monday that 32 bodies have been found in the rubble of a collapsed 10-storey building in the southwestern Iranian city of Abadan.
Rescuers were rushing to evacuate the wreckage at the scene in Khuzestan province to find all other people trapped, reports said.
The exact number of missing persons is unknown, but an estimated 35 others are still trapped under the rubble.
On Sunday, the Iranian government announced nationwide mourning in honor of the victims of the tragedy.
The Iranian Judiciary News Agency reports that 10 people have been arrested in connection with the incident, in which the owner of a building and a contractor were killed.
The undeveloped building, known as Metropol, was located on a busy street in the city of Abadan, surrounded by commercial and medical facilities and offices.
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Parts of the building suddenly collapsed on the 25th, trapping dozens of people under the rubble.