The FBI is offering a reward for information leading to an arrest for the fire at the Islamic Center of Joplin.
Agents released video of a man walking up to the mosque and throwing something on fire onto the roof.
Tips and leads have dried up which is why they're working extra on the investigation.
Members of the mosque are mystified by the attack.
"Maybe it's a test to our patience how we deal with this situation and how we cope with it," said Imam Lahmuddin
A $15-thousand dollar reward is offered for information leading to the arrest of the person who set the fire.
This isn't the first crime targeting the Islamic center in Joplin. Four years ago the mosque's sign was set on fire and no one was caught.