Bangladeshi police said on Tuesday one of the men they shot dead during the siege of a Dhaka cafe on the weekend may have been a hostage killed by mistake, while the hunt for accomplices of the gunmen who killed 20 people focused on six suspects.

Police on Tuesday named five Bangladeshi gunmen who stormed the restaurant in Dhaka's diplomatic zone late on Friday. Most of the victims in the violence claimed by Islamic State were foreigners, from Italy, Japan, India and the United States.

It was one of the deadliest militant attacks in Bangladesh, where Islamic State and al-Qaida have claimed a series of killings of liberals and members of religious minorities in the past year.