Story highlights

More than 220 people were rescreened

A small knife found by flight attendant forced pilots to return to the gate

CNN  — 

A small knife found by a flight attendant forced the 221 people on an American Airlines flight out of Miami to be rescreened Wednesday, a law enforcement official told CNN.

Flight 905 had not yet taken off when pilots decided to return the plane back to the gate.

Local and federal authorities are investigating the incident.

CNN’s Devon Sayers and Mike Ahlers contributed to this report.