Police investigated a suspicious item in Terminal 4 at Sky Harbor International Airport Thursday night, shutting down security gates in the process.

The A and D security checkpoints were closed from about 9 p.m. until 10:15 p.m. while police investigated an unattended bag.

The B and C checkpoints remained open, according to airport officials.

Last week, the airport closed the same checkpoints for a similar issue before giving the all-clear.