Lok Sabha witnessed uproar on Monday over the issue of alleged threatening slogans raised at a Congress rally against Prime Minister Narendra Modi, leading to adjournment of proceedings. The Lok Sabha was first adjourned till 12 noon and then till 2 PM as BJP and Congress members were locked in a verbal duel on the issue. Parliamentary Affairs Minister Kiren Rijiju condemned the alleged slogans raised at a Congress rally here on Sunday and demanded an apology from the top leadership of the main opposition party. "We are political opponents, not enemies. Congress workers have threatened to dig the grave of the prime minister at the Congress rally. This is the most unfortunate incident to happen," Rijiju said as the Lok Sabha convened for the day at 11 am, triggering protests from the Congress members. "Congress should now tender an apology for giving threat to the prime minister," Rijiju said. Amid the turmoil, Speaker Om Birla adjourned the proceedings till 12 noon. At the Congre