(CNN) -- Miley Cyrus came to Mexico "like a wrecking ball" -- to quote her hit song -- offending fans at Monterrey concert and prompting a federal investigation. This happened Tuesday in Monterrey, during the first of four scheduled "Bangerz Tour 2014" gigs in Mexico: As Cyrus was "twerking" in the middle of a song, one of the two dancers contorting beside her used a Mexican flag to spank the oversized, false buttocks she was wearing. Adding insult to injury: Tuesday was Mexico's Independence Day. Mexican law is very stern on the subject of respecting the flag, the Mexican seal and national anthem: Any action "that implies contempt or lack of respect to the Homeland Symbols will be punished according to its severity and the condition of the offender."Miley Cyrus act in Monterrey included a "spanking" with the Mexican FlagNuevo Leon state legislator: "She brazenly made fun of our flag"He says Mexico's Interior Ministry has opened an investigationTuesday, the day of the incident, was Mexico's Independence Day
"I felt truly offended and annoyed by the fact that a foreign artist feels like she can come here and make fun of and mock our national flag on _, September 16th.