Investigators began looking into the father and son in 1990.

Then, just as quickly, most investigators began to discount it.

The fire appeared suspicious almost from the moment investigators began looking into it.

While the rescuers' work is almost over, the investigators are just beginning.

Later, the investigators will begin tests that destroy the material.

Investigators began using it to improve communications in many fields.

Gripping the arms of his chair, the investigator began to rise.

But within a few days, investigators began to hear about disgruntled clients.

As he spoke, the board's investigators were only beginning to assemble the evidence needed to reach any conclusions.

It said federal investigators had begun processing the resulting evidence.