Six people remained at Jackson Memorial Hospital Monday after they were injured in a bus crash at Miami International Airport that killed two people.
Four of those injured are in stable condition; two others are in critical condition.
Serafin Castillo, 86, and Francisco Urana, 56, were both killed when the bus hit an overpass at the first terminal.
Survivors of the crash said they warned Ramon Ferriero, the driver, that he was going the wrong way. At the point of impact, there are large, yellow signs warning of a 8' 2'' clearance and advising drivers of vehicles taller than that to turn left.
Investigators are trying to determine why Ferriero continued instead of veering left or stopping. Ferriero could not be reached for comment Monday.
"You never expect something like this," said Mayling Hernandez, the owner of Miami Bus Service Corporation, which employs Ferriero.
Hernandez said Ferriero had been working for them for a few months and had a good record. She added that he was recommended to them.
"He just had an accident. He just had an accident," said Hernandez.
The bus was carrying a group of Jehovah's Witnesses who were picked up at Sweetwater Kingdom Hall and were on their way to the Christian Convention Center in West Palm Beach.
Traffic homicide detectives are reviewing surveillance video. It's unclear if the video captured the moment crash happened.