Two people were killed in the blast, who are suspected to be Indian Mujahideen (IM) men. It is alleged that the men died while trying to make an IED.
BJP secretary Siddharth Nath Singh alleged that the Burdwan police instead of handing over to the NIA the materials recovered, took away the entire evidence and destroyed it.
Posing questions to Banerjee, he asked, "Did it not have a TMC office on the ground floor?"
"We can safely conclude that West Bengal under Mamata Banerjee's rule has become a safe haven for anti-national elements and Jihadi activities," Singh further said.
The police investigating the blast in Burdwan, West Bengal said on Sunday as per an HT report that video clips of Islamic fundamentalist activities were found in the cellphones seized from the blast spot.
On Sunday, two women were also arrested and remanded to police custody for two weeks in connection with the blast which left two suspected militants dead.
The CID of West Bengal police is looking into possible involvement of terror outfits like LeT and HuJI in the blast.
It is suspected that the victims of the explosion were associated with a militant outfit as a large number of watch dials, SIM cards, and other tools required to make improvised explosive devices were found in the house, police had said on Saturday.