"More than one person's voice has been heard from inside," an official said.
The announcement comes as hurricane season is ongoing through Nov. 30.
At least one person was killed, and three others are missing, after more than a dozen people were rescued from the water as a boat sank in the San Francisco Bay Tuesday afternoon.
An under-construction Manhattan high-rise at risk of collapse was stabilized late Tuesday and some evacuations of nearby buildings were lifted.
Authorities announced that the death toll rose on Monday to 3,535 while Venezuelans are left alone to recover loved ones as international rescue teams depart.