Islamic State have claimed responsibility for the deadly attack

Incident similar to recent killings of atheist bloggers in Bangladesh

A university professor was hacked to death by a gang of attackers while on his way to work in northwestern Bangladesh.

A.F.M. Rezaul Karim Siddique was attacked on his way to the state-run university in the city of Rajshahi, where he taught English.

The attackers used sharp weapons and fled the scene immediately, according to deputy police commissioner Nahidul Islam. ISIS have claimed responsibility for the horrific attack.

A.F.M. Rezaul Karim Siddique (pictured) was attacked on his way to the state-run university in the city of Rajshahi, where he taught English

The attack was similar to recent killings of atheist bloggers in Muslim-majority Bangladesh by radical Islamists.

The Islamic State group claimed responsibility for the attack, according to the SITE Intelligence Group, which monitors jihadi websites. No further details were available.

At least three other professors at Rajshahi University have been killed in recent years, allegedly by Islamist groups.

Sajidul Karim Siddique, a brother of the professor, said he was a 'very quiet and simple man' who was focused on studying and teaching.

He led a cultural group and used to edit a literary magazine.

'So far as we know, he did not have any known enemies and we never found him worried,' Sajidul said. 'We don't know why it happened to him.'

Sajidul Karim Siddique, a brother of the professor (pictured), said he was a 'very quiet and simple man' who was focused on studying and teaching

The government of Prime Minister Sheikh Hasina has been cracking down on militant groups, which it blames for deadly attacks in the past year on secular bloggers, minority Shiites, Christians and two foreigners.

It accuses the opposition of supporting religious radicals in seeking to retaliate against the government for prosecuting suspected war crimes during the country's 1971 independence war.

Some of the attacks were claimed by the Islamic State group, but the government dismisses those claims and says the Sunni extremist group has no presence in Bangladesh.

The sister of slain professor Siddiquee mourns after hearing the news of her brother's brutal death

Following Saturday's attack, hundreds of students and teachers marched on Rajshahi University's campus and blocked a highway, demanding justice.

Amnesty International condemned the killing and said those responsible must be brought to justice.

'The vicious killing is inexcusable and those responsible must be held to account,' Amnesty's South Asia director, Champa Patel, said in a statement.

'This attack sadly fits the gruesome pattern established by Islamist extremist groups in Bangladesh who are targeting secular activists and writers.

'The authorities must do more to put an end to these killings.