Rescue workers digging through the rubble of a Beirut building for the third day on Saturday said there was no longer hope of finding someone alive more than a month after a massive port explosion shattered Lebanon’s capital city, Reuters reported.

About 50 rescue workers and volunteers, including a specialist team from Chile, had worked for three days to locate anyone after sensors on Thursday detected signs of breathing and heat.

“Technically speaking, there are no signs of life,” Francisco Lermanda, the head of volunteer rescue group Topos Chile, said in a news conference on Saturday evening, adding that rescuers had combed 95% of the building.

“The building is really crumbling, it’s scary and there’s a lot of danger to the team,” said George Abou Moussa, head of Lebanon’s civil defense.

The August 4 blast in Beirut killed about 190 people, injured 6,000 more, and devastated whole neighborhoods.