The death toll from a powerful explosion at Iran's biggest port of Bandar Abbas has risen to at least 40, with more than 1,200 people injured.

The death toll from a powerful explosion at Iran's biggest port has risen to at least 40, with more than 1,200 people injured, state media reported on Sunday.

Iran's interior minister on Monday blamed "negligence" for a massive explosion that killed 65 people at the country's largest commercial port, with firefighters still battling a blaze at the facility two days later.