Two United Airlines passengers were hospitalized last week after their plane had to suddenly slow its descent into San Francisco International Airport to avoid another plane, the airline said.

The incident aboard United Flight 2428 occurred on September 19 as the flight took off from Newark, New Jersey, the airline told Fox News Digital in a statement Thursday morning.

The plane began its descent with the seat belt fastened as the pilots performed the maneuver “to account for another aircraft at a lower altitude,” the airline said.

“Two customers, including one who was not in his seat at the time, reported possible injuries and were transported to a hospital,” the United Airlines statement said. “We are grateful to our crew for their efforts to ensure the safety of our employees and customers.”

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The plane landed safely after slowing its descent to San Francisco International Airport last week, officials said. (Nicolas Economou/NurPhoto via Getty Images, File/Getty Images)

The Federal Aviation Administration (FAA) confirmed to Fox News Digital in a statement that the agency is investigating the incident.

The pilots aboard the plane were responding to an onboard warning that another aircraft was “in the area,” the FAA said. (Charly Triballeau/AFP via Getty Images / Getty Images)

“United Airlines Flight 2428 responded to an onboard warning that occurred in Oakland Air Route Traffic Control Center airspace at approximately 12:45 p.m. local time on Thursday, September 19, indicating that another aircraft was in the area.” said the FAA. “The United flight landed safely at San Francisco International Airport.”

Two passengers aboard the United flight were taken to the hospital after reporting possible injuries, the airline said. (Robert Alexander/Getty Images/Getty Images)

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The FAA said “there was no loss of safe separation,” meaning the two aircraft maintained a minimum separation distance from each other.

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Last month, a United Airlines flight from Cancun to Chicago was diverted to Memphis, Tennessee, after the plane experienced “a brief period of severe turbulence” that left one passenger hospitalized and six others injured, officials said at the time.