UPDATE 10:03 a.m. IST -- The Delhi police reached the CPI (M) office after it received calls threatening Left leader Sitaram Yechury, according to ANI news agency. 

Original Story: 

Home Minister Rajnath Singh's statement that Lashkar-e-Taiba (LeT) chief Hafiz Saeed had backed recent events in the Jawaharlal Nehru University (JNU) in Delhi commemorating Parliament attacker Afzal Guru was based on inputs from various agencies, his ministry said. 

Singh's comments had faced criticism as the Congress and Left parties has demanded evidence for his claim. "The statement of the Home Minister is based on the inputs available from different agencies," a Home Ministry spokesperson was quoted saying by NDTV

However, The Indian Express reports that Singh's allegations were based on a tweet from a Twitter account purportedly of Pakistan-based Hafiz  Saeed, which called for support for the JNU students who had organised an event on Feb. 9 to mark the anniversary of the hanging of Afzal Guru. It is not yet verified if the account belonged to the 26/11 attack mastermind.

Meanwhile, while CPI(M) leader Sitaram Yechury, who had hit out at the Modi government for its action against students, has received death threats, ANI news agency reports.

The students' union leader of JNU has been arrested and charged with sedition, sparking a heated debate on social media. The Delhi police had also detained seven other students on Saturday. 

The matter has snowballed into a serious political issue, which is even likely to spill into the upcoming budget session that begins next week. Congress vice-president Rahul Gandhi had visited the campus to meet with protesting students. 

Singh had issued a warning last week stating that the government "will not tolerate anti-national activities."