Nearly 100 hours after the 7.8 magnitude earth quake, rescuers could still detect signs of life in the rubble of Hangwang Town, of Mianzhu City, according to sources with the Chinese national rescuing team Friday.

"The possibility is very great that we can rescue the buried," said a team member.

Rescue work has come to a critical stage on Friday as survival chances for those trapped are becoming slim after the first 72 hours, but a rescuing team member said, "Giving-up is excluded from our dictionary."

As of 6:00 PM on Friday, rescuers from east China's Jiangsu Province have found a survivor under the debris of a flattened chemical fertilizer plant in Shifang city.

The government has vowed not abandon the search for survivors.

"Where there is a beam of hope, we will spare no efforts to save the trapped," said Chinese Premier Wen Jiabao in his work tour at the earthquake hit regions.

President Hu Jintao flew into Sichuan on Friday, and called for relief efforts to be stepped up, saying rescue work has entered its "most crucial phase".

A 23-year-old nurse was rescued at 2:23 PM on Friday from a collapsed town hospital in Beichuan, four days after the earthquake that could claimed more than 50,000 lives.

Rescuers have saved a student from the earthquake debris in Beichuan Middle School, 80 hours after the earthquake hit Beichuan town on Friday morning.

Rescuers said they could still hear weak yelling for help from under the collapsed building, and are expecting more miracles.

The earthquake death toll has exceeded 21,500 while 14,000 others remained buried as of 4:00 PM on Friday, the Sichuan provincial government said.

About 159,000 people were injured in Monday's massive earthquake and 4.8 million people were relocated.

(Xinhua News Agency May 16, 2008)