The first batch of 70 buses installed with press-button emergency window breakers have begun operating in southern Chinese metropolis of Guangzhou, capital of Guangdong province, recently.

This photo, taken on July 20, 2014, shows press-button emergency window breakers that have been installed on the operation panel of a city bus in Guangzhou, south China's Guangdong province. [Photo / Xinhua]

When engaged, the emergency window breakers will blast the bus's glass windows open in a way so as not to injury the vehicle's occupants.

The mechanism reportedly takes between 0.1 and 0.3 of a second to bust open the windows.

Safety concerns on public buses have grown recently after a man set a Guangzhou bus on fire to vent his frustration over incurred gambling debts on July 15. The resulting explosion killed two people and injured 33 others.

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