Concerned about the law and order situation in the state following Thursday’s stone attack on BJP chief JP Nadda’s convoy at Diamond Harbour, home minister Amit Shah is set to visit the state for a two-day visit from December 19, said BJP leaders aware of developments. Shah had visited Bengal last month – on November 4 – to formulate campaign strategy for the assembly polls due early next year. He also took part in outreach programmes. The party earlier said he and Nadda would take turns in visiting the state every month. It was Nadda’s turn to visit Bengal in December. The centre has summoned Bengal’s top police and administrative officers over Governor Jagdeep Dhankhar’s report to Home Minister Amit Shah detailing “deteriorating law and order” in the state after an attack on party chief JP Nadda’s convoy on Thursday. The Home Ministry has summoned the state’s Chief Secretary and police chief on Monday. Bengal Chief Secretary and Director General of Police have been summoned on December 14 for a meeting with the Union Home Secretary “to discuss the law and order situation…including the recent attacks on Z-category protectees”, according to a home ministry letter. The Home Minister has also sought a report from the Bengal government over what he called “sponsored violence” after Mr Nadda’s convoy was attacked with bricks, stones and sticks near Kolkata. Some leaders were injured and cars were damaged in the incident, which the BJP said was the work of supporters of Chief Minister Mamata Banerjee’s Trinamool Congress.The Chief Minister has accused the BJP of staging the attack and falsely accusing her party men as part of a political conspiracy in the run-up to the Bengal election due in six months.