LUCKNOW, India (NEWSnet/AP) — Part of an under-construction road tunnel in India collapsed Sunday after a landslide, trapping more than 30 workers, officials said.

Rescue work is in progress and oxygen is being pumped through a pipe into the collapsed section of the tunnel to help workers breathe, said Manohar Tamta, an Uttarakhand state relief official.

Workers have sent signals indicating that they are safe, a government official said, according to Press Trust of India.

The collapsed portion of the tunnel is about 500 feet from the entrance, said police officer Arpan Yaduvanshi. Food is being sent to the trapped workers, PTI quoted Yaduvanshi as saying.

About 160 rescuers from federal and state disaster relief agencies are using drilling equipment and excavators to reach the workers.

Uttarakhand state is dotted with Hindu temples and draws a major flow of pilgrims and tourists each year.

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