Tensions over immigration reform heightened in the Phoenix area's East Valley Thursday when students raised a Mexican flag over Apache Junction High School — and then other students yanked it down and burned it. "I know (they) shouldn't have burned the Mexican flag," said Jacob Stewart, a 16-year-old sophomore. "I heard it was raised above the American flag and that just irked me." He said the turbulence was tied to debates going on in the state Legislature and Congress, where ideas ranging from offering illegal immigrants a chance at citizenship to making them felons are being floated. Freshman Chelsea Garcia,...