Phoenix Sky Harbor Airport's Terminal 4 reopened and resumed normal operations after an unattended car in the area caused evacuations and delays Sunday morning.

According to the Phoenix Police Department, just after 7:30 a.m., airport police noticed a rental vehicle left unattended at the second-floor drop off area.

Airport police later determined that the vehicle was suspicious. This caused part of the terminal to close and caused evacuations, flight delays and cancellations.

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The airlines affected by the situation included Air Canada, American, British Airways, Southwest Airlines, Volaris, WestJet and Condor.

According to Southwest Airlines, 34 of their flights were canceled as a result of the incident.

"Many times we come on a package or something small, when it's something the size of a vehicle, that's more complex, it requires different methods to thoroughly search the vehicle to make sure it's safe," explained Sgt. Tommy Thompson with the Phoenix Police Department.

Traffic was at a standstill outside of the airport for hours.

"I was dropping some friends off at terminal 3, but because this airport is so confusing to me I missed the terminal 3 so I was looping around and now I can't get back," explained on traveler.

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Some people tried to walk to the terminal only to be turned around.

"There's a police line, they have a bomb robot checking either an unattended car or a bomb."

"I need water, it's Arizona! I need water and I need to get some place cool so we're going to head to our car and just sit in there," a traveler said.

Phoenix police said the vehicle was cleared and Terminal 4 resumed normal operations just before 11:30 a.m.

Police are encouraging travelers to check with their airlines for the status of their flights before coming to the airport. Phoenix police added that airlines are aware of the situation and are working with passengers to accommodate them.

To see a complete list of flight cancellations and delays, click here.

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