dhaka
Football Soccer - Germany v Italy - EURO 2016 - Quarter Final - Stade de Bordeaux, Bordeaux, France - 2/7/16 Players line up during a minutes applause in tribute to the victims of the terrorist attack in Dhaka, Bangladesh before the matchReuters

The police on Sunday said that local gunmen, and not the Islamic State group, were behind the attacks that claimed the lives of 20 people late Friday. The police authorities had also tried to arrest five of the seven gunmen before.

Authorities are also investigating possible links with international Islamist militant groups, Reuters reported.

Bangladesh Prime Minister Sheikh Hasina on Saturday declared two days of national mourning beginning on Sunday.

The ISIS had claimed responsibility for the attack through Amaq, the group's news agency, releasing a statement warning citizens of "crusader countries" and that their people would not be safe "as long as their aircraft are killing Muslims".

According to the US monitoring website SITE, ISIS posted photos of five of its fighters in masks, who were supposedly involved in the attack, grinning before a black flag. These are unconfirmed reports. However, the country's Home Minister Asaduzzaman Khan was quoted by Reuters as saying that neither ISIS nor al Qaeda were involved in the killings and that local militants were behind the spate of killings in Bangladesh since 18 months.

"This was done by Jamaat-ul-Mujahideen Bangladesh," Khan said. The group claims to be the representative of the ISIS in the Muslim-dominated country.

Shahidur Rahman, deputy inspector general of police, was quoted by Reuters as saying that the gunmen were from rich families and well-educated.

National police chief Shahidul Hoque was quoted as saying: "Five of them were listed as militants and law enforcers made several drives to arrest them."

Football Soccer - Germany v Italy - EURO 2016 - Quarter Final - Stade de Bordeaux, Bordeaux, France - 2/7/16 Players line up during a minutes applause in tribute to the victims of the terrorist attack in Dhaka, Bangladesh before the match
Football Soccer - Germany v Italy - EURO 2016 - Quarter Final - Stade de Bordeaux, Bordeaux, France - 2/7/16 Players line up during a minutes applause in tribute to the victims of the terrorist attack in Dhaka, Bangladesh before the matchReuters
A man places a sign as others light candles during a vigil in Kolkata, India, to show solidarity with the victims of the attack at Holey Artisan restaurant after Islamist militants attacked the upscale cafe in Dhaka, Bangladesh, July 2, 2016.
A man places a sign as others light candles during a vigil in Kolkata, India, to show solidarity with the victims of the attack at Holey Artisan restaurant after Islamist militants attacked the upscale cafe in Dhaka, Bangladesh, July 2, 2016.Reuters
Army soldiers patrol near the Holey Artisan restaurant after gunmen attacked the upscale cafe, in Dhaka, Bangladesh, July 2, 2016.
Army soldiers patrol near the Holey Artisan restaurant after gunmen attacked the upscale cafe, in Dhaka, Bangladesh, July 2, 2016.Reuters
People react near the Holey Artisan restaurant after Islamist militants attacked the upscale cafe in Dhaka, Bangladesh, July 2, 2016.
People react near the Holey Artisan restaurant after Islamist militants attacked the upscale cafe in Dhaka, Bangladesh, July 2, 2016.Reuters
Army soldiers patrol in a boat on a lake near the Holey Artisan restaurant after Islamist militants attacked the upscale cafe in Dhaka, Bangladesh, July 2, 2016.
Army soldiers patrol in a boat on a lake near the Holey Artisan restaurant after Islamist militants attacked the upscale cafe in Dhaka, Bangladesh, July 2, 2016.Reuters
Security personnel keep watch, after gunmen stormed the Holey Artisan restaurant and took hostages, in the Gulshan area of Dhaka, Bangladesh July 2, 2016.
Security personnel keep watch, after gunmen stormed the Holey Artisan restaurant and took hostages, in the Gulshan area of Dhaka, Bangladesh July 2, 2016.Reuters
Security personnel check vehicles after gunmen stormed the Holey Artisan restaurant and took hostages, in the Gulshan area of Dhaka, Bangladesh July 2, 2016.
Security personnel check vehicles after gunmen stormed the Holey Artisan restaurant and took hostages, in the Gulshan area of Dhaka, Bangladesh July 2, 2016.Reuters
A wounded police personnel is helped by a colleague, after gunmen stormed the Holey Artisan restaurant and took hostages, in the Gulshan area of Dhaka, Bangladesh July 1, 2016.
A wounded police personnel is helped by a colleague, after gunmen stormed the Holey Artisan restaurant and took hostages, in the Gulshan area of Dhaka, Bangladesh July 1, 2016.Reuters
People try to help an injured person, after gunmen stormed the Holey Artisan restaurant and took hostages, in the Gulshan area of Dhaka, Bangladesh July 1, 2016.
People try to help an injured person, after gunmen stormed the Holey Artisan restaurant and took hostages, in the Gulshan area of Dhaka, Bangladesh July 1, 2016.Reuters
Bangladesh Border Guards are seen near Gulshan restaurant, after gunmen stormed a restaurant popular with expatriates in the diplomatic quarter of the Bangladeshi capital, in Dhaka, Bangladesh July 1, 2016.
Bangladesh Border Guards are seen near Gulshan restaurant, after gunmen stormed a restaurant popular with expatriates in the diplomatic quarter of the Bangladeshi capital, in Dhaka, Bangladesh July 1, 2016.Reuters
Also read