"Reports on the increase in the number of al-Nusra Front groups active in the city of Aleppo have been received via the hotline of the reconciliation center. According to the received information, a detachment of over 90 people has arrived from the Bshantara settlement to the Ashraf quarter. The situation demonstrates the terrorists might be preparing to full-scale attack," the center said in a statement.
Syria has been mired in civil war since March 2011, with government forces loyal to Syrian President Bashar Assad fighting numerous opposition factions and extremist groups, including al-Nursa Front, outlawed in many countries including Russia.
Aleppo, the largest city in Syria, was attacked by al-Nusra Front militants in 2012. Since then, Syrian government forces have been fighting for the city.