Story highlights Brussels Airport closed through Sunday

Eurostar has resumed regular Brussels service

Foreign governments urge citizens visiting Belgium to be vigilant

(CNN) European travel disruption looked set to continue in the wake of deadly bomb attacks in Belgium as the country's main airport extended a passenger shutdown until Sunday.

A spokeswoman confirmed to CNN that Brussels Airport will be closed to passenger traffic at least through the weekend.

Tensions have remained high following Tuesday's bomb attacks, claimed by terror group ISIS, in which 31 people died.

Two bombs targeted the airport while a third hit the city's Maelbeek metro station.

The incidents prompted the U.S. State Department to issue a warning to its citizens in Europe.