Jaipur Mar 29 PTI A massive fire broke out in the forest area of Sariska Tiger Reserve in Rajasthans Alwar district a forest official said on TuesdayThe cause of the blaze which erupted on Monday evening and has been burning an area of around five to seven sq km is yet to be ascertained officials saidTiger movement in the area has been affected by the fire the forest official saidAccording to officials around 150-200 people including the forest staff are engaged in controlling the fire Two helicopters from Army have also been called in to douse the blazeVillagers residing in the periphery of the fire-affected area have been asked to move to safety the official said PTI SDA NB NSD