"And without conducting any serious investigation, the police charged the case."

The question is whether the Senate will retreat from our commitment to a serious investigation.

Now the three explorers were ready to begin serious investigation.

However, there has been no serious investigation of that theft.

There is no evidence that a serious investigation into his killing was ever conducted.

Why, after all, has his inner circle tried so hard to prevent a serious investigation of what happened on 9/11?

Local police generally did not conduct serious investigations into such incidents.

Others were taken up in the 1830s, but the site was then lost, and serious investigation only began over a century later, in the 1970s.

"This looks more like a grab for media attention than a serious investigation."

I ask you to conduct a serious and immediate investigation into what happened.