Assailants have hacked two Rapid Action Battalion (RAB) personnel and injured another during an anti-drug raid at Narayanganj's Masdair area.
A separate police operation earlier on Tuesday in Rupganj also came under violent attack, leaving at least seven officers injured and a suspect forcibly taken away.
RAB-11 Commander Lt Col HM Sajjad Hossain said the attack in Masdair occurred around 2pm near Boalia Canal. The injured personnel have been identified as Nazibul, Mahi and Ibrahim.
Nazibul is undergoing treatment at Dhaka Medical College Hospital in critical condition, according to the RAB.
RAB-11 Deputy Director Abdur Rashid said four plainclothes officers were collecting intelligence in the area when they were attacked.
Earlier the same day, around 5am, police came under attack during a raid at the Chanpara Rehabilitation Centre in Rupganj Upazila, where they had gone to arrest Jubo Dal leader Shamim Miah in an arms case.
Rupganj Police chief Md Alauddin said Shamim's associates and family members attacked the team and snatched him away from custody. �"bdnews24