NEW DELHI: A suspected explosion has been reported outside the office of the Punjab BJP in Chandigarh, prompting a response from security agencies.Security officials have since launched an investigation and have cordoned off the adjoining area. The sounds were heard around 5 pm, according to state BJP leader Vineet Joshi.Senior police officers, including senior superintendent of police Kanwardip Kaur, along with CFSL team reached the spot to take stock of the situation.