MOSCOW, March 5 (RAPSI) – Moscow's Lefortovsky District Court has extended the detention of Yulai Davletbayev, who allegedly masterminded a terrorist attack which was foiled in Moscow last May, and his accomplice Robert Amerkhanov, the court's press office told RAPSI on Wednesday.

Davletbayev will remain in detention until June 6. The detention of Amerkhanov has been extended until May 21. A terrorist attack was allegedly planned for May 9 Victory Day in Moscow by the Islamic Party of Turkestan, an al-Qaeda affiliated terror group.

In late May, two terrorists said to be involved in organizing the attack were killed in Orekhovo-Zuyevo near Moscow. Amerkhanov was detained. According to the media, the flat where they lived was rented by Davletbayev from Sterlitamak, Bashkortostan. Davletbayev was detained near Moscow on June 6, 2013.

Davletbayev and Amerkhanov have been charged with banditism, terrorism and illegal keeping and manufacture of weapon. They face up to 20 years in prison if convicted.

The National Anti-Terrorism Committee said earlier that the group escaped the law-enforcement agencies after committing a number of crimes in Russian republics in the Volga region. In 2010 they underwent military and ideological training at an international terrorist organization in an area on the border of Afghanistan and Pakistan.

The Islamic Party of Turkestan, also called the Islamic Movement of Uzbekistan or IMU, has been declared a terrorist organization by the Russian Supreme Court. Its operation is prohibited in many countries in Europe and Central Asia, as well as in the United States. FSB Director Alexander Bortnikov believes that it is no less dangerous than al-Qaeda.

In March 2013, the Russian Interior Ministry announced the detainment of the leader of the IMU's Moscow branch. He was to be extradited to Uzbekistan.