The District government will investigate city hospitals and clinics to determine whether they are withholding reports of medical errors that killed, injured or sickened patients, a top city official testified Wednesday.

“Unless we improve the reporting technology … the process will not serve to improve either the analysis or the feedback to the reporting health care facility,” Department of Health executive Feseha Woldu told a D.C. Council hearing called to examine “adverse events” in hospitals and clinics.