Four teenagers suspected of planning an Islamic extremist attack have been arrested in Germany, authorities said on Friday.

Three of the suspects — two girls who are 15 and 16, and a 15-year-old boy — come from various parts of the western North Rhine-Westphalia state, Germany's most populous. They were arrested after a court issued warrants for them over the Easter weekend, prosecutors in the city of Duesseldorf said.

A fourth suspect, a 16-year-old boy, was arrested in the southwestern state of Baden-Wuerttemberg, German news agency dpa reported.

The three detained in western Germany are suspected of having declared themselves prepared to carry out an “Islamist-motivated terror attack” and planning such an attack, prosecutors said in a statement. They didn't specify how advanced the plans were, and said they couldn't give further details because of the suspects' young age and the ongoing investigation.