An illegal immigrant suspected of drug smuggling escaped from a transport vehicle with two others while in route to an Arizona border patrol station, and he’s eluded federal authorities for days.

According to U.S. Border Patrol officials, Heriberto Castellanos-Uribe, a 22-year-old suspected drug smuggler, escaped with two other illegal immigrants through a ceiling hatch on a bus bound for the Casa Grande Border Patrol Station around 10 p.m. Tuesday, KOLD reports.

The bus, operated by a government contractor, was stopped at a light at the intersection of Trekell Road and Florence Boulevard in Casa Grande when the men made their escape.

Tucson sector Border Patrol officials set up a perimeter in the area and caught one of the men around 1 p.m., though officials did not release that man’s name or age.

Casa Grande Police arrested a second escapee, 25-year-old Augusto Daniel Chavez-Sosa, around 2:10 p.m. in the 1400 block of North Cameron Avenue, near Desert Winds High School, according to the department’s Facebook page. KOLD reports Chavez-Sosa, of Honduras, was previously deported in 2015.

Chavez-Sosa was turned over the Border Patrol, who locked him up at the Casa Grande Border Patrol Station, The Republic reports.

Castellanos-Uribe, meanwhile, remains unaccounted for, and police are scrambling to locate him. Border Patrol spokesman Vicente Paco told the Tucson Sentinel authorities do not consider Castellanos-Uribe an immediate threat to the public, but are asking anyone with information on his whereabouts to call the Case Grande Border Patrol Station at 520-836-7812.

Border Patrol officials told Tri Valley Central the illegal immigrants were in restraints in the bus when they escaped, but would not reveal how man guards were watching the men.

According to the Sentinel:

The bus is one of nearly 100 transports operated by G4S Secure Solutions, as part of federal contract worth more than $234 million to transport detainees along the southwest border region.