Summary：One of Paris& 39; busiest lines resumed service early Wednesday after a reported "power failure" paralyzed the net

One of Paris' busiest lines resumed service early Wednesday after a reported "power failure" paralyzed the network and required the evacuation of hundreds of people stranded in a tunnel.

According to local media, a breakdown on Line 1 shortly after 20:00 (1800 GMT) on Tuesday forced a train to grind to a halt between stops in the popular Le Marais District, causing the network to come to a standstill.

Passengers, including overseas visitors, were evacuated from at least eight trains in an operation lasting over two hours. The operator of Paris Metro, the RATP, was not able to determine the cause of the glitch immediately.

The incident ignited complaints on social media. Many said on Twitter that the evacuation in suffocating heat was chaotic and accused the authorities of being tardy in giving information and explanations.

Five people were reportedly in need of treatment for heat exhaustion during the evacuations at a time when the city is experiencing a record heat wave.

Line 1 of Paris Metro connects the Louvre Museum, the Champs-Elysees Avenue and other tourist landmarks of the French capital.