French far right leader Marine Le Pen on Wednesday said France should wage a war against radical political and religious groups after a young man of Arab origin was disclosed behind the serial deadly shootings in the southern city of Toulouse.

"I think the fundamentalist risk was underestimated in our country, as politico-religious groups are developing against a laxness," Le Pen told iTele news channel.

"Now, we have to wage this war against these politico-religious fundamentalists who kill our children...," she added.

Earlier, Interior Minister Claude Gueant said the gunman who claimed to belong to al Qaeda, was a French citizen of Algerian origin who had been in Pakistan and Afghanistan.

Heading the anti-immigration National Front party, Le Pen decried the shootings was the outcome of Paris "unnecessary and reprehensible" policy in Afghanistan.

"Today Afghanistan has bogged down and the war in Afghanistan arrived on French territory," she said.