Major General Hassan Sarwardy, who is overseeing the rescue operation, earlier said rescuers would look for survivors for one more day estimating they could survive as high as 72 hours under the debris and then were likely to go for a massive salvage campaign using heavy equipment.
Witnesses said anxious crowds around the debris turned violent as they lost cell phone links with their trapped relatives and friends under the ruins.
Police had to use tear gas canisters to disperse the mob while officials called for patience saying steps for quickened salvage operations using heavy equipment at the moment could shake their ruined structure endangering the survivors.
Most of the victims of the country's worst ever collapse were workers of Bangladesh's main export earning garments industry while the building housed five garment units alongside 300 shops and branch of a private bank.
