He urged anyone with information that could assist the investigation to get in touch.
The Sun
The police were seeking documentation which might assist the investigation.
Times, Sunday Times
When he arrives to assist the investigation, his energy and manner drives the old guard to distraction.
Times, Sunday Times
We saw promises to assist the investigation then, but they resulted in denial and obfuscation and the stifling of due process and the rule of law.
Times, Sunday Times
Her handbag, shoes and scarf were missing, and the local priest and police made a joint appeal for the public to come forward with information that might assist the investigation.
The Sun