New York Police Department officials are looking for signs that disgruntled officers have started making more low-level arrests.

NYPD statistics show the arrests plummeted in the weeks after two patrolmen died in a brazen daytime ambush in December. Ticketing for traffic and parking violations virtually stopped as well.

Union officials have denied a work stoppage. But the numbers were seen as further evidence of growing rancor between the rank and file and Mayor Bill de Blasio.

The department was expected to release the latest weekly numbers later Monday.

(AP)