(Updates death toll, injured) CHANDIGARH, India, May 2 (Reuters) - A bus carrying about 50 people skidded off a mountain road and fell into a gorge in northern India on Wednesday, killing 19 people and injuring about 30, police said. Rescuers pulled the injured passengers from the mangled bus, they said. Some were critically hurt. The accident took place at Kotkhai, northeast of Shimla, capital of the mountain state of Himachal Pradesh. Bus accidents on mountain roads are common in India, where highway regulations are poorly enforced. Last week, at least 22 people were killed when a bus skidded off a mountain road and plunged into a stream in Indian Kashmir.