PARIS (AP) — French police have searched the home of the brother of a gunman who attacked Jewish schoolchildren earlier this year, and questioned a former spy chief in the probe.

A judicial official says the search Wednesday at Abdelkader Merah’s home in southern France stemmed from new questioning he underwent this month. The official, who gave no other details, spoke on condition of anonymity because of the sensitivity of the investigation.

Police say Merah’s brother, Mohammed, killed three children, a rabbi and three paratroopers in the name of radical Islam in March. The killings rocked France.

Abdelkader Merah, in police custody for months, faces preliminary charges of complicity to plotting the killings.

Investigators questioned the former chief of France’s DCRI intelligence agency this week in the probe, the Sipa news agency reported.