A day after Barrackpore BJP MP Arjun Singh's close aide and councillor Manish Shukla was killed by unknown assailants in Titagarh, the West Bengal CID on Monday arrested two persons in connection with the case. The two were picked up from their residences in the district, a senior police officer said. "We have arrested two persons in connection with the case. There are more people involved in the killing. The probe is on," the CID official said. Meanwhile, high drama unfolded on Monday evening after Shukla's body underwent post-mortem at Nil Ratan Sircar Medical College and Hospital (NRSMCH) in Kolkata. The post-mortem report revealed 14 bullet injuries on the body showing how mercilessly the councillor was killed in absence of his security personnel who were apparently on leave on Sunday.