Duesseldorf prosecutors said in a statement that the 2 boys and 2 girls were "strongly suspected of planning an Islamist-motivated terror attack and of having committed to carrying it out" and had also "committed to carrying out a crime – murder and manslaughter," per Daily Mail.
While investigators have not released further details about the plot, German outlet Bild reported "They wanted to attack Christians in churches and police officers in police stations with knives and Molotov cocktails in the name of the terrorist organization 'Islamic State'. They even considered getting firearms."
According to the outlet, police found a machete and a dagger in the home of one of the 15-year-old girls, whose father was a known donor to ISIS. When they searched her phone, they found a group chat with all 4 of the teens discussing areas to target, such as Dortmund, Dusseldorf and Cologne.
After the 2 girls were arrested, the 2 boys continued to detail plans for the attacks in the same chat, which led to their arrests. Churches and synagogues were named as specific targets, and the attack was reportedly planned for during Ramadan or Easter.
They have only been identified by investigators as Albina H (16), Wiam S (15), Julius S (15) and Yusa P (16). Investigators also said that Julius S was the "driving force" behind the attacks.