Activists marched on the U.S. Federal Courthouse and Houston City Hall in downtown Houston around noon to protest the acquittal. The City Council was forced to recess at about 2:40 p.m. CST when several dozen protesters who had been watching the proceedings gathered outside the chamber, before flooding the room shouting " No justice, no peace!" and "Trayvon Martin!"

　　Two of the protesters were detained by police after being cleared from the chamber. No one was arrested at the courthouse, according to the real-time report of the Houston Chronicle.

　　Tuesday's demonstrations followed a Monday march which had temporarily blocked traffic on a highway.

　　Zimmerman, a 28-year-old neighborhood watch volunteer in Florida, had been charged with a second degree murder after shooting dead 17-year-old African-American boy Trayvon Martin in February 2012.

　　A jury in Florida acquitted him Saturday, triggering heated nationwide debate over potential injustice against ethnic minorities in the case, as well as protests in some big cities, including New York and Los Angeles.