Two passengers on a United Airlines Boeing 757 flight from Newark to San Francisco were injured when the pilots responded to an onboard midair collision system warning, the Federal Aviation Administration said.

An United flight bound for International Airport had to suddenly slow its descent to avoid another aircraft last week, leading to the hospitalization of two passengers, the airline said Tuesday.

Two passengers were injured Thursday when a United Airlines flight abruptly altered its course as it descended into San Francisco. "United flight 2428 was descending to SFO on Sept. 19 with the seatbelt sign on when it slowed its descent to account for another aircraft at a lower altitude.