Bangladesh has begun two days of mourning for 20 people, mostly foreigners, who were killed when militants attacked a popular restaurant in the capital Dhaka.
During the attack, which has been claimed by the so-called Islamic State militant group, seven gunmen took a number of hostages, and reportedly tortured and killed those who could not recite verses from the Qu'ran.
Thirteen hostages were saved after police launched a rescue operation.
Hostages in the Bangladesh cafe who were unable to recite verses from the Qu'ran were reportedly tortured and killed, while those who could were spared.
The 10-hour siege at the Holey Artisan Bakery in the country's capital Dhaka, ended with 20 hostages and two Bangladeshi police officers dead. Six of the attackers were also killed.
Those who could not recite from the Qu'ran "were tortured", Mr Karim added.
Authorities are currently interrogating one of the attackers who was captured by commandos during the rescue.
Most of the 20 people killed by the attackers were foreigners, among them a US citizen.
At least 13 people have been rescued following the raid, according to a Bangladeshi official.
Twenty hostages have been killed in an attack on a cafe in the Bangladeshi capital. So-called Islamic State have claimed responsibility.