A transient jumped over a counter inside Los Angeles City Hall and vandalized the office of a city councilman Friday afternoon, underscoring already existing security concerns at the building, CBS News reports.

The intruder reportedly walked through one of the building’s entrances, which is supposed to be secured by key card access and an officer. He then went up the stairs to the fourth floor, where he wandered into Councilman Mike Bonin’s office. He then used a permanent marker to write “The Cartel is after me,” before he was arrested for vandalism and being under the influence.

Mayor Eric Garcetti called the incident “unacceptable,” and he hopes that metal detectors and extra personnel at public entrances will help tighten access. Currently, there is only one metal detector at one of the five public entrances to City Hall, the article reports.