BAYTOWN, Texas -

It could take one year for investigators to determine what caused a plane to crash on a baseball field in Jenkins Park in Baytown on Monday night. The plane was left upside down in the park. An investigator with the National Transportation Safety Board said it might have hit a power line.

"There is a report of an impact mark on the high transmission tower just to the north and west of the scene about 1 mile," NTSB investigator Tom Latson said. "Although none of those miles did break."

Latson said he will look at mobile GPS device in the cockpit, will inspect the fuel tanks and could have the engine disassembled. He said he would visit the Baytown Airport to check the fuel facility and go to the hospital to check on the survivors.

The plane crashed shortly after taking off from the airport. Latson did not yet know where it was headed.

DPS said, Gary Flynt, 48, his wife, Linda Flynt, 44 and their 8-year-old son were on board the plane when it crashed. They were all flown to Memorial Hermann hospital where they were in stable condition.

Gary Flynt is considered to be in fair condition. Linda Flynt is in critical condition.

"It was pretty scary," said Beth Schlauch, a neighbor of the Flynts. "Frightening and then not to know their conditions right away. Our neighbors are awesome people. Very kind and caring people. In fact, when we moved here two years ago, right after we got here, they brought over a cake, introduced themselves and let us know if there's anything you need while you're moving in."

The Flynts are members at Second Baptist Church Baytown. Ministers spent the night and day at the hospital.

"They are getting great care and we have staff members that have seen them this morning and just giving God the glory that they are going to be fine," associate pastor Mark Stafford said.