"The letter says that ahead of the return of Prime Minister Narendra Modi from his foreign tour, bombs will explode at our party headquarters and other public places," Tamilisai Soundararajan, president, Tamil Nadu BJP said, according to a PTI report.
She said her party had lodged a complaint with police after receiving the letter. Recently, similar threats were received by the Kalpakkam Atomic plant and Hindu Munnani office.
A senior police officer said the threat letter to IGCAR and the BJP office appeared to be "similar, a copy and paste," exercise, the PTI said. However, they were probing the matter.
Last year in April, a low-intensity blast took place near the BJP headquarters in Bangalore, leaving 16 people injured.
State BJP chief said the threat was from al-Qaeda and the party would fight it
On February 14, 1998, several blasts took place in Coimbatore in Tamil Nadu killing 58 people and injuring over 200. Islamic fundamentalist body Al Ummah was found responsible for the attacks that were part of the conspiracy to target senior BJP leader LK Advani.
In May 1991, India's former prime minister Rajiv Gandhi was assissanated in a suicide bomb attack in Sriperumbudur during an election rally.