A Houston-bound Boeing 737-800 flight operated by Southwest Airlines encountered a safety scare as its engine cover detached mid-flight, striking the wing flap.

The Federal Aviation Administration (FAA) has launched an investigation into the incident, which prompted the aircraft’s return to Denver International Airport.

Although no injuries were reported, the event adds to a series of mechanical issues affecting Boeing planes in recent months, raising concerns about their safety.

Southwest Airlines assured passengers of their commitment to safety and apologized for the inconvenience caused by the delay.