Schools, colleges and institutes were also open in Ambala on Friday, but they were ordered to be closed by the district administration and the students were sent back home at about 11 am. Complete blackout to be imposed in Ambala tonight; use of inverters for outdoor lighting banned The blackout order in Ambala was issued to safeguard public safety and strategic interests, District Magistrate Ajay Singh Tomer said. An Air raid siren was sounded in Ambala after receiving a warning from the Indian Air Force Station of a “possible attack". Ambala News: जीएसटी में दवाओं पर तो राहत, स्वास्थ्य जांच ...