evidence: NEW DELHI, India — Tensions were high Wednesday in the western Indian city of Udaipur, a day after police arrested two Muslim men accused of slitting a Hindu tailor’s throat and posting a video of it on social media, in a brutal attack representing a dramatic escalation of communal violence in a country riven by deep religious polarization. The killing comes after months of rising tensions between Hindus and Muslims, and has raised fears of increased violence.