A Bangladeshi student group has vowed to resume protests that sparked a lethal police crackdown and nationwide unrest unless several of their leaders are released from custody.

Members of Students Against Discrimination, whose campaign against civil service job quotas precipitated the unrest, said they would end their weeklong protest moratorium.

The group’s chief Nahid Islam and others “should be freed and the cases against them must be withdrawn”, Abdul Hannan Masud told reporters in an online briefing.

Masud, who did not disclose his location because he was in hiding from authorities, also demanded “visible actions” be taken against government ministers and police officers responsible for the deaths of protesters.

“Otherwise, Students Against Discrimination will be forced to launch tough protests” from Monday, he said.

Last week’s violence killed at least 205 people including several police officers, according to an AFP news agency count of police and hospital data, in one of the biggest upheavals of Prime Minister Sheikh Hasina’s 15-year tenure.

Islam and two other senior members of the protest group were on Friday forcibly discharged from a hospital in the capital Dhaka and taken away by a group of plainclothes detectives.

Earlier in the week Islam said he was being treated at the hospital for injuries police inflicted on him during an earlier round of detention and said he was in fear for his life.

Home minister Asaduzzaman Khan had said the trio were taken into custody for their safety but did not confirm if they had been formally arrested.

At least 9,000 people have been arrested nationwide since the unrest began according to Prothom Alo, Bangladesh’s largest daily newspaper.

Bangladesh’s mobile internet network was restored in the afternoon, 11 days after a nationwide blackout imposed at the height of the unrest.