A strong blast shook Nalagarh, Himachal Pradesh, near a police station on Thursday. Windows cracked even 40 metres away, and the sound was heard up to 500 metres. Police registered a case under mischief, rash conduct endangering life, and the Explosive Substances Act. On Friday, police said forensic experts collected samples and CCTV footage is being reviewed. They are working with Punjab Police and the National Investigation Agency (NIA). A social media post claimed the explosion was done by Babbar Khalsa International and Punjab Sovereignty Alliance. The message said an improvised explosive device (IED) was used in protest. It accused Himachal Pradesh police of not acting against synthetic drug smuggling into Punjab. The post warned, "IEDs would be planted in vehicles and headquarters of the police administration" if no action was taken. Police have not commented on the claim. Nearby Punjab has faced similar attacks on police stations. Punjab's Director General of Police blames Pakistan and says the attack planners operate from North America, Europe, Southeast Asia, and Gulf countries.