Ambala: Ammonia gas leaked from a pipeline here on Friday causing panic among employees of a milk plant. Around six employees of the Vita milk plant were affected by the ammonia gas and were admitted to local hospital, official sources said here. A number of people of the adjoining colonies complained of the effect of the gas on their eyes. The leakage began when a truck of the milk plant hit the pipeline in the wee hours. The plant was temporarily closed after the incident.