Investigation documents containing personal details of around 400 people, including a criminal suspect, were lost after a Japanese police officer got drunk and passed out on the street, police and local media reported. 

A police source told AFP on Monday that the 49-year-old officer in the western Hyogo region lost a bag carrying the documents between 11 pm on Friday and 5 am on Saturday. The documents contained names and addresses, he said, without explaining further.  

Citing police officials, a major Japanese media outlet said that the officer in question went out drinking with his colleagues and fell asleep while walking home with the bag.  After he woke up near a train station, the bag containing documents was not found, which meant that information about around 400 people was lost, the reports said.  

It is not the first time Japanese officials are facing public embarrassment over data breaches after drinking sessions.  

Another incident happen in June when authorities in the city of Amagasaki said a contractor lost a bag containing a USB memory stick with personal data on all 460,000 residents after the person went out for drinks and fell asleep outdoors on the way home. Yet unlike the current case, the stick was found a day after news broke of its disappearance.