Boston police say they're narrowing the gap between how often black residents are subjected to police searches as compared with whites and other ethnic groups.

But an Associated Press review of recently released police data suggests the improvement is more modest than the department claims.

Boston police also haven't yet provided key information about the reasons and outcomes of the encounters.

In January, police released data on nearly 150,000 stops, searches and frisks conducted from 2011 to early 2015 that did not lead to arrests.

The department hailed it as a victory for transparency. It also said it was proof Boston was making progress in addressing racial disparities in police-civilian encounters.

A department spokesman says it stands by its initial conclusions and promises more data are coming.