Travelers in Belgium hoping for a return to normalcy will have to wait until at least Monday, the airport has announced.

Brussels Airport, which was the site of the explosions that killed 13 and injured 80 on Tuesday, will remain closed through Sunday as investigators continue to comb through the site for evidence.

The airport was originally scheduled to be closed through Friday. 

"Because the forensic investigation is still underway, we currently have no access to the building," the airport says on its website. "Until we can assess the damage, it remains unclear when we can resume operations."

The airport has started a luggage return operation to reunite passengers with their belongings that were left behind in the chaos of the attacks.

The airport’s closure now falls over the Easter weekend, an important holiday period and crucial travel time for many Europeans. Many countries have March 28 off work, with some also breaking for Good Friday as well.

The airport in Zaventem saw a surge of travelers in 2015, when 220,000 passengers, an increase of 6 percent, traveled through it.

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