What began as a protest over wages in Noida on Monday quickly snowballed into a day of chaos, with over 40,000 factory workers facing off against security officials, key roads choked with traffic, heightened security, and a sense of unease at some entry points. The protest across 80 locations in the city - triggered by the Haryana government's decision to hike the minimum pay - took a violent turn when the protesters set vehicles and properties on fire, and threw stones during an altercation with the police in Noida's Phase-2 and Sector 63. Cops said that some "outsiders" attempted to incite the unrest in Noida after workers had dispersed peacefully. Uttar Pradesh Labour Minister Anil Rajbhar said a possible Pakistani link is under probe in the Noida unrest - in the wake of recent terror-related arrests in the region.