Massive fireworks displays are a favorite part of summer in Japan.

But competition is getting fierce over good spots to enjoy them from.

People in Tokyo are causing problems by going to extremes to claim choice spots.

Some are even marking their turf with spray paint.

People painted the grass here along the central Arakawa River as much as two weeks before fireworks scheduled for Saturday.

The Arakawa hosts one of Tokyo’s best shows and in recent years the practice has become rampant.

In the past, people laid out tarps and ropes until both practices were banned.

About five years ago people turned to spray paint. The practice is prohibited but not illegal.

A local woman says patrols have little effect.

Authorities posted signboards, but for the moment, they seem to be losing the fight.