According to the Washington Post, Najim Laachraoui, 24, who died after detonating a suicide bomb at Zaventem airport in Brussels yesterday, is believed to have also helped make explosives used (poorly) in ISIS’ attacks in Paris:

An Islamic State bombmaker whose DNA connected him to November’s Paris attacks was one of two suicide bombers at Brussels Airport, two intelligence officials said Wednesday, the strongest link yet between two Islamic State attacks that have stunned Europe with their power and planning.

Per the Post, two other attackers have been identified: Ibrahim el-Bakraoui, 29, who was the second suicide bomber at the airport, and his younger brother Khalid el-Bakraoui, 27, who blew himself up in a Brussels metro station.

The fourth accomplice is the man shown in an image released by police yesterday, who is believed to have left the airport immediately before the attacks. It’s unclear if police have yet to identify that man or if they have chosen to temporarily withhold his name.

The two attacks in Brussels are believed to have killed at least 30 while injuring another 230. Yesterday, ISIS claimed responsibility for the offensive.