London: Auhtorities have found an explosive device while conducting the raids in Schaarbeek, a northern suburb of Brussels, the Belgian prosecutor's office has confirmed.

People light candles in tribute to victims of terrorist attacks in Brussels on March 22, 2016 at a makeshift memorial. Pic/AFP

"The searches ... have led to the discovery of an explosive device containing nails, among other things. The investigators have also discovered chemical products and an Islamic State (IS) flag," The Guardian reported here on Wednesday.

Earlier a third bomb was found at the airport and was destroyed by the security services.

At least 34 people were killed and some 200 injured in coordinated bomb attacks on Brussels' main airport and the subway. One of the two airport blasts is believed to have been a suicide bombing.