File photo taken Oct. 13, 2015, shows a building that houses the National Police Agency in Tokyo. (Kyodo) ==Kyodo

TOKYO - The number of police officers in Japan disciplined for drunk driving in the first six months of this year surged 2.4-fold from a year earlier to 12, recent police data showed, with an increase in social drinking following the easing of COVID-19 restrictions likely to be a factor behind the rise.