Sylhet: A police officer and a leader of Bangladesh Chhatra league (BCL), who were injured in bomb blasts in front of Gotatikor Madrasah adjacent to militant den Atia Mahal at South Surma upazila in Sylhet, succumbed to their injuries on Sunday, raising the death toll from the blast to six.

News agency United News of Bangladesh reported, Jalalabad Police Station Officer-in-charge (investigation) Monirul Islam and Fahim Ahmed Mahdi, a resident of Kuchai area of the upazila and deputy secretary(environment affairs) of South Surma upazila BCL unit succumbed to their injures at Sylhet Osmani Medical College Hospital .

Earlier on Saturday evening, four people, including a policeman and an activist of Bangladesh Chhatra League (BCL), were killed and 40 people injured in two bomb blasts near the militant hideout.

The army-led operation to the militant hideout that began at about 2:00pm on Saturday was continuing till filing of this report at 2:00pm on Sunday.

Meanwhile, local people heard sound of several gunshots in the building at about 11:00am.

Besides, the administration imposed section 144 in the areas adjacent to Shibbari area and law enforcers have tightened security in the city.

Besides, two injured officers of Rapid Action Battalion (RAB) were referred to Dhaka Combined Military Hospital (CMH) due to their critical condition.

The injured are Lt Col Abul Kalam Azad, commanding officer of intelligence wing of RAB headquarters and deputy commanding officer Major Azad.

Besides, the authorities of OMCH cancelled the vacation of all staff of the hospital following the incident.

Jedan Al Musa, Additional Deputy Police Commissioner (media) of Sylhet Metropolitan Police (SMP), said two people carrying bombs came to the spot riding a motorcycle and hurled those at about 6:45pm on Saturday when one of the bombs went off, leaving BCL activist Wahidul Islam Opu, dead on the spot and 17 people including Fahim injured, while another bomb remained unexploded. 

Minutes later, the unexploded bomb went off when police picked it up to diffuse, leaving Sylhet court inspector Abu Kawsar dead on the spot and officer-in-charge (investigation) Monirul Islam of Jalalabad Police Station, and OC Shah Harun-or-Rashid of South Surma Police Station seriously injured. 

Police recovered a motorcycle from the spot, Musa added.

Meanwhile, Shiblu Malakar, 27, son of Basanta Malakar of the area, suffered bullet wounds as he was watching the drive from a temple adjacent to Atia Mahal.

Amid explosions and gunshots the members of joint forces, led by army Para Commandos stormed the militants' den on Saturday afternoon and rescued 78 members of 28 families trapped in the building.

After about a 30-hour siege to the 'militants' den' by joint forces , a team of Para Commando Battalion of Bangladesh Army, led by GOC Major General Anwarul Momen, launched operation, 'Twilight', in  the building named 'Atia Mahal' around 9 am on Saturday.

On Friday night, army commandos joined the joint forces to raid the house after police cordoned it off in the early hours of Friday. A SWAT unit reached the spot on Friday from Dhaka.