ST. CHARLES – Police said alcohol and faulty equipment contributed to a two-car crash Sunday morning that injured four people and shut down Route 31.

Police continue to investigate the crash, which occurred before 10:59 a.m. on Route 31, just north of Wildrose Springs Drive. According to police, Luis Pina, of Aurora, was driving southbound on Route 31 and lost control of his Pontiac Grand Prix, crashing into a Chevy Tahoe traveling northbound driven by Manuel Nunez of Aurora and occupied by two passengers.

Pina was extricated from his vehicle and transported to Delnor Hospital in Geneva. Nunez and his passengers were also transported to Delnor Hospital.