Authorities in Belgium charged two more men for alleged links to the bombings in Brussels last month, reports said, citing the prosecutor's office. Over 30 people were killed in the attacks on March 22 at the Brussels airport and a subway.

The suspects were identified only as Smail F. and Ibrahim F. and local reports said that the two men were brothers. A report by NBC News said that the suspects were charged with terrorist murders, participating in the activities of a terrorist group, and attempts to commit terrorist murders as a perpetrator, co-perpetrator or accomplice. It was not clear when or where the men were detained by officials.

According to a report by the Associated Press (AP), which cited the prosecutor’s office, Smail was born in 1984 and Ibrahim was born in 1988. The statement also said, according to AP, that the investigation is “continuing actively day and night.”

A report by BBC said that one of the brothers was suspected of renting the house used by Osama Krayem, who was charged Saturday, and Khalid el-Bakraoui, who attacked the Maelbeek Metro Station.

On Saturday, Belgium charged four suspects who were thought to be involved in the Brussels attack. Among them was the last known fugitive of November's Paris attacks that killed 130 people, and a Swedish national linked to the event. One of the suspects, Mohamed Abrini, admitted to the authorities that he was the man in the hat spotted on CCTV footage from the Brussels airport, before the attack.