The news media report that police fired tear gas to break up the crowd after protesters tried to storm the provincial governor's office.

VOA: standard.2009.12.10

So, if you only get a sniff of the tear gas in Barth, here you get a whole draught full of it.

如果你在Barth问到了一点催泪瓦斯的气息，那么你在这将感受到满是它的气味。

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Police responded by using tear gas, water cannons, baton charges and rubber bullets to disperse the crowd.

VOA: standard.2009.09.01

Security forces fired tear gas to break up the pro-Zelaya marchers, who are also accused of vandalizing buildings in the country's capital overnight.

VOA: standard.2009.09.22

Officers responded by firing tear gas shells and using their bamboo sticks to repel demonstrators.

VOA: standard.2009.03.28

In other parts of Bangkok, soldiers fired tear gas and protesters hurled firebombs.

VOA: standard.2009.04.13

Police responded by firing tear gas and beating back protesters with batons.

VOA: standard.2009.03.15

The authorities respond with tear gas and,sometimes,fatal gunfire.

VOA: standard.2009.04.08