India’s anti-terror investigating agency said Sunday it arrested a man from Indian-controlled Kashmir on suspicion of conspiring with a suicide bomber to carry out a deadly car blast in the capital New Delhi, Associated Press reported.

The National Investigating Agency said in a statement that the car that exploded on Monday was registered to Amir Rashid Ali, who it alleged had traveled to New Delhi from Indian-controlled Kashmir to facilitate the purchase of the vehicle. It said Ali’s arrest was a “major breakthrough” in the case.

The explosion killed 10 people and injured 32 others near the city’s historic Red Fort. Indian officials called it a “heinous terror incident” carried out by “anti-national forces.”