| police investigate | 107.11 | He said police are investigating. | ||
| authority investigate | 42.13 | Authorities were still investigating the crash. | ||
| official investigate | 31.93 | Officials are investigating. | ||
| prosecutor investigate | 19.49 | Prosecutors are investigating. | ||
| government investigate | 14.02 | The government was investigating. | ||
| commission investigate | 11.98 | A special commission was investigating. | ||
| agency investigate | 8.49 | No police agency investigated. | ||
| committee investigate | 7.04 | A jury committee is investigating. | ||
| department investigate | 5.20 | The department is now investigating them. | ||
| detective investigate | 4.74 | Detectives are investigating the claim. | ||
| company investigate | 4.48 | The company is investigating. | ||
| team investigate | 4.48 | The team investigates. | ||
| office investigate | 4.15 | His office will investigate the trip. | ||
| panel investigate | 3.82 | A high-level IOC panel is investigating. | ||
| officer investigate | 3.55 | Officers are investigating. | ||
| regulator investigate | 3.55 | U.S. regulators are investigating the trades. | ||
| agent investigate | 2.90 | Federal agents are investigating. | ||
| expert investigate | 2.90 | Experts investigate reports of new mass grave. | ||
| army investigate | 2.76 | The army was investigating. | ||
| military investigate | 2.76 | He said the military is investigating. |