A top Indian university has banned the screening of a BBC documentary about Prime Minister Narendra Modi’s role during the deadly 2002 sectarian riots, after his government attempted to block its spread online.

The broadcaster’s programme alleges that the Hindu nationalist Modi, premier of Gujarat state at the time, ordered police to turn a blind eye to an orgy of violence there that left at least 1,000 people dead, most of them minority Muslims.

Students at the prestigious Jawaharlal Nehru University in New Delhi had planned to screen the documentary on Tuesday, defying efforts by Indian authorities to restrict its showing.

But a memo from the university’s registrar late on Monday ordered students to cancel the event and warned it would take “strict disciplinary action” if its edict was disobeyed.

“Such an unauthorised activity may disturb peace and harmony of the university campus,” it said.

Modi’s government has been accused of stifling dissent by free-speech activists and opposition leaders for years.

On Saturday it used emergency powers under India’s controversial information technology laws to block the documentary from being shared on social media.

Government adviser Kanchan Gupta slammed the series as “hostile propaganda and anti-India garbage” disguised as a documentary.

India’s order to social media platforms to block links to the documentary “flagrantly contradicts the country’s stated commitment to democratic ideals”, Beh Lih Yi of the Committee to Protect Journalists said in a statement on Monday.

The 2002 riots in Gujarat began after 59 Hindu pilgrims were killed in a fire on a train. Thirty-one Muslims were convicted of criminal conspiracy and murder over that incident.

The two-part BBC documentary cited a previously classified British foreign ministry report quoting unnamed sources saying that Modi met senior police officers and “ordered them not to intervene” in the attacks on Muslims that followed.

It also said the violence was “politically motivated” and the aim “was to purge Muslims from Hindu areas”.

The riots were impossible “without the climate of impunity created by the state Government… Narendra Modi is directly responsible,” it concluded.

Modi ran Gujarat from 2001 until his election as prime minister in 2014 and briefly faced a travel ban by the United States over the violence.

An investigation team appointed by the Indian Supreme Court to probe the role of Modi and others in the violence said in 2012 it did not find any evidence to prosecute him.