Rescuers work at the fatal landslide site in Shenzhen as strong signals of life were detected on Monday.[Photo by Chai Hua/chinadaily.com.cn]

Rescue workers are still racing against the clock to find more survivors after strong signals of life have been detected at a fatal landslide site in Shenzhen, south China's Guangdong province.

As of Monday afternoon, a total of 91 people remained missing after a landslide buried 22 buildings at the Hengtaiyu industrial park in Shenzhen City on Sunday, according to local authorities.

The missing include 59 male and 32 female.

The park is located in the Guangming New District in northwestern Shenzhen. A nearby section of the West-to-East natural gas pipeline exploded as the landslide hit the area.

"The site is quite narrow and is located on a ramp, so it is very difficult for vehicles to enter," said Ao Zhuoqian with Shenzhen's fire control department. "We have to go there on foot."