More than 60 security cameras made by Canon Inc. have been hacked and rendered unusable at places including key waterways, a fish market and a care facility for people with disabilities, it was learned Monday.

Many of the networked cameras had messages left on their screens saying, "I'm Hacked. bye2."

Although it is unclear why those particular cameras were targeted, two cities — Yachiyo in Chiba Prefecture and Ageo in Saitama — that lost control of waterway cameras noted they had not reset the default password.