A brother of Mohamed Merah, the Islamic radical who killed seven people in attacks on a Jewish school and French paratroopers in 2012, has been ordered to stand trial on terrorism charges.

Authorities initially suspected a lone-wolf attack. But after nearly four years of investigation, the Paris prosecutor's office said Wednesday that Abdelkhader Merah, in custody since 2012, will be sent to trial in an anti-terrorism court along with one other person.

The prosecutor's office says Abdelkhader Merah is accused of involvement in an al-Qaida-related group that plotted attacks against Jews and soldiers and obtained weapons and stole a scooter for his brother's rampage. Among the charges is complicity to murder.

Three Jewish schoolchildren, a rabbi and three paratroopers were killed. Mohamed Merah died in a shootout with police.