Belgian authorities have filed charges against four people suspected of being involved in the terror attacks in Brussels.

On Friday, the “suspect in white” who escaped after the airport attack was also caught. Police had been searching for him since last month’s attack. He is believed to have worked with the suicide bombers as well as the ISIS terrorists who attack Paris last November.

Two additional suspects were arrested over the past few days, but were released after questioning.

The Brussels attacks took place in the city’s airport and a metro station. Thirty-two people were killed and 270 wounded.