Shooting at Quebec mosque committed by other Muslims

A shooting took place at a mosque in Quebec City, leaving 6 people dead. According to the following:

Witnesses said at least one gunman shouted 'Allahu akbar!' while opening fire at the Quebec Islamic Cultural Centre Sunday night, killing six men.

However, they say only 1 suspect is now in custody, and it's one with a French-sounding name. The second is apparently still at large. Is the one who is caught a Muslim convert? If he is, there's no doubt the elitists will soon be exploiting this to say he's just a "misunderstander".