DUBAI (Reuters) - The death toll from a powerful explosion at Iran's biggest port of Bandar Abbas has risen to at least 25 dead, with more than 700 people injured, state media reported on Sunday, as firefighters worked to fully extinguish the fire.

President Vladimir Putin has offered Iran Russian help in dealing with the aftermath of a blast that rocked the Iranian port of Bandar Abbas and has expressed his condolences over the loss of life, the Kremlin said on Sunday.

At least 25 people were killed and hundreds of others were injured in a massive blast that rocked the Iranian port city of Bandar Abbas on Saturday.