However, state health and environmental officials added that they would immediately initiate an intensive investigation.

But after four and a half years of intensive investigation, there are no simple answers in sight.

They consider it to be a great curiosity but not worth intensive investigation.

He claimed that it was an intensive investigation but came up empty.

Since the 19th century at the latest, these vases have been the subject of intensive investigation.

"I didn't view it necessary to meet daily, but the matter is still under intensive investigation," he said.

The site has only recently become the focus of intensive investigation.

However, three months later he began more intensive investigations.

This allowed for more intensive investigation of the area.

"We knew this was something that deserved very intensive investigation."