This summer, they began to focus their investigation on what role that vacuum might play.

"What this does provide us is an area on which we must now focus our investigation."

His team focused their investigation around Rattlesnake Island where many sightings have taken place.

Bureau officials are trying to determine what kind of explosive was used in the attack, which will help focus their investigation.

Israeli police said they have focused their investigation on Israeli militants.

In the episode, the detectives focus their investigation on the casino.

When we know more, we'll know where to focus our investigation, which line of inquiry to follow.

As a result, she argues, the detective focused his investigation too narrowly on her.

However, given yesterday's incident, we are focusing our investigation on him.

"It involves exactly the area where they have focused their investigation."