Fixing smashed subway car windows is costing the transit system money it doesn't have. The MTA is offering a reward to stop the vandalism before it gets worse.

Each window on a recent 7 train looks like a baseball landed right in the middle with a unique spider web of cracks fanning out. The MTA is offering more than $12,000 for information about who is doing this. It’s a small sum compared to the cost of the damage. The MTA says there have been 70 incidents of smashed windows since May. It's cost $300,000 to repair.

NYPD Inspector Jason Savino is in charge of the investigation and is asking the public to film any vandals.

“Put on your little detective shields, and if you see something say something. Certainly make us aware of it,” he said.

Police have video of one suspect, but have not made any arrests.