Two men arrested in connection with Islamist terrorist Mohamed Merah's Toulouse killings have been released without charge, judicial sources said Saturday. 

The two men, aged 28 and 30, had been suspected of complicity in Merah's March 2012 shooting spree, which left seven people, including three Jewish children, dead in and around Toulouse, AFP reported.

The two suspects, said to have links to Islamist extremists, had been detained since Tuesday under anti-terrorism legislation. One of them was released Thursday, the other on Saturday, sources said. 

French police doubt that Merah could have acted alone but so far the only person charged with helping him has been his brother Abdelkader.