It's thought a gas leak may have caused the blast.

人们认为可能是煤气泄漏引起了爆炸。

《柯林斯英汉双解大词典》

If you suspect a gas leak, do not strike a match or even turn on an electric light.

假如你怀疑有煤气泄漏，不要划火柴，甚至连电灯都不要开。

《牛津词典》

The neighbors came out of their houses to see if we had a gas leak.

邻居们从他们的房子里出来看看我们是否出现了煤气泄漏。

youdao

One hundred sixty-seven men were killed when the structure exploded after a gas leak.

VOA: special.2009.03.22

Rachna Dhingra represents the Bhopal Group for Information and Action, which has been working to rehabilitate and get justice for the victims of the gas leak.

VOA: standard.2010.06.10

Satinath Sarangi, a prominent activist working with the victims of the gas leak, says the fight could be led by the generation born in the aftermath of the disaster.

VOA: standard.2010.06.10

The plant has been shut since last week following complaints of a gas leak.

BBC: Sterlite Industries plant

Nearby houses were evacuated because of a subsequent gas leak, CNN affiliate WNDU reported.

CNN: 2 killed in Indiana plane crash

Dozens of homes were evacuated and trains cancelled because of a gas leak in Portsmouth.

BBC: Trains cancelled after Portsmouth gas leak