HPD's bomb squad responded to the terminal, investigated the bag, and gave the all-clear.
Terminal C was closed briefly due to a suspicious bag. The bag has been cleared by HPD and all areas will reopen immediately.— Houston Bush Airport (@iah) March 8, 2018
Bill Begley, spokesman with Houston Airports System, said a TSA dog sat on an unattended bag in the terminal, signifying the bag as suspicious.
WATCH: SKYEYE13 ABOVE BUSH AIRPORT
As a result, the bomb squad was called and the airport cleared the terminal of people, shifting them to Terminal E.
Social media users who appear to be posting from Bush Airport on Wednesday night have described the scene.
Nick Hellyar tweeted that the airport was "completely shut down by HPD with machine guns."
IAH Terminal C completely shut down by HPD with machine guns. Anyone know what’s going on?— Nick Hellyar (@NickHellyar) March 8, 2018
@iah Terminal C shut down w/ security issue? Need some answers please.— David G (@BoSoxFanDMG) March 8, 2018
Terminal C at IAH being evacuated. Hmmmm.— Paloma P (@pittipatch) March 8, 2018
Hello, Friend. Did you take this photo? Can we please have your permission to use this photo on all ABC News platforms and its partners?— ABC13 Houston (@abc13houston) March 8, 2018