Russia’s Investigative Committee has closed a criminal case against Domodedovo airport owner Dmitriy Kamenshchik over 2011 terrorist attack at the request of Prosecutor General’s Office, RAPSI learned in the Basmanny District Court of Moscow on Friday.

Earlier, prosecutors repeatedly called on the Investigative Committee to drop the case against Kamenshchik.

The Domodedovo airport owner Dmitriy Kamenshchik and several other ex-managers have been charged in the case over 2011 terrorist attack. According to investigators, they have not provided sufficient security level that let the suicide bomber freely enter the arrival lounge and set off an explosive.

A suicide bomber detonated a bomb in the Domodedovo Airport’s international arrivals hall, killing 37 people and injuring 172, on January 24, 2011.

Doku Umarov, Russia’s most wanted terrorist at the time, claimed responsibility for the attack. Altogether, 28 men connected with the terrorist organization called the Caucasus Emirate were linked to the attack, according to the investigators. Seventeen of them were killed in special operations in 2011, and four were detained.

In November 2013, a Moscow Region court sentenced three men to life in prison and a fourth man to 10 years for their role in the suicide bombing.