A California prosecutor is taking legal action against parents.

Their children were in e-bike crashes.

Orange County District Attorney Todd Spitzer has more than 24 open investigations.

His office has already charged four parents.

One is the mother of a 14-year-old.

That teen is accused of killing a pedestrian.

Other areas are doing different things.

New York City warned online shops about selling illegal e-bikes.

This came after a 17-year-old died.

New Jersey now says riders must be at least 15.

They also need a license.

California has no minimum age for lower-powered bikes.

Some parents and supporters say these steps are not enough.

Monica Stafford's daughter broke her skull.

Stafford asked for one set of rules for the whole country.

She said officials are in a "Wild West of laws."

Cycling groups say many dangerous vehicles are really e-motorcycles.

Shops sell them as e-bikes, but that is not true.

Researchers say e-bike injuries are worse than regular bike injuries.

Dr. John Austin said patients are often younger.

They also do not wear helmets.

Parents like Sharon Franke say safety begins at home.

She said parents should do research and training.

She said balancing fun and safety is "overwhelming right now."