be under investigation

In all, eight companies were said to be under investigation.

A man already under investigation by the police for something.

Officials said the cause of the fire was under investigation.

Both state and local police said the case was under investigation.

The cause of the fire was under investigation last night.

The cause of the fire was still under investigation early today.

The cause of the fire was under investigation, the police said.

At that time, many high administration officials were under investigation.

The cause of the fire was under investigation early this morning.

On top of all that, the city is under investigation by both the federal government and the state.