"conclude the investigation" is correct and usable in written English.
You can use it to refer to the end of an investigation where all the results are gathered, analyzed, and summarized. For example: After months of investigation, the police were finally able to conclude the investigation and present their findings.
"The arrest of Peabody does not conclude the investigation as investigators are continuing to follow leads associated with this case," the marshal's office stated.
Keane said there was a misperception that the government had to indict Bonds, or others, or conclude the investigation at the end of the grand jury, which was investigating perjury and obstruction of justice.
It is not clear why that did not conclude the investigation.
Mr. Specter urged the President to testify completely to help conclude the investigation.
"We haven't reached the point of no return yet" for Pakistan's government to positively conclude the investigation, Menon stated.
The IOC president, Jacques Rogge, is keen to conclude the investigation, which is also likely to lead to widespread changes in the way the 8.8m tickets available to the Olympics are distributed, before the London Games.
The inspector general found that these communications showed "extremely poor judgment and a gross lack of professionalism," but did not conclude the investigations were "rigged" against Trump.
By the time the investigator concluded the investigation in April 2014 and deemed her allegations not sustained, the girl had turned 18.
The commission concluded the investigation in July 2000 without taking action against the company.
The Commission shall, with respect to any such investigation initiated prior to November 3 , 1988 issue an order concluding the investigation not later than 12 months after November 3 , 1988
The prosecutor, Lt. Col. Mahmoud Obeidat, "has concluded the investigation and the detained suspects are expected to stand trial at the State Security Court in late March," the official said.
