Lebanon's Information Minister Manal Abdel Samad and Environment Minister Demianos Kattar resigned on Sunday following the huge explosion that rocked capital Beirut on Tuesday, killing at least 158 people and injuring 6,000. 

"I apologize to the Lebanese because we could not meet their demands. Since change in Lebanon remains elusive and the reality does not match our ambitions, and after the horrible explosions that hit the city, I resign from the government," Abdel Samad said. 

Kattar later became the second cabinet member to step down over the deadly blast that unleashed public rage. 

"In light of the enormous catastrophe ... I have decided to hand in my resignation from government," the environment minister announced in a statement, saying he had lost hope in a "sterile regime that botched several opportunities."

A number of MPs also submitted their resignations a day earlier. 

On Saturday afternoon, thousands took to the streets in downtown Beirut in anti-government protests that demand the overhaul of the political system, days after the massive explosion. Demonstrations continued on Sunday. 

Primary information reveals that more than 2,700 tons of high-explosive chemical ammonium nitrate stored unsafely in a warehouse at the Port of Beirut since 2014 may have caused the deadly explosion. 

Lebanese Prime Minister Hassan Diab said on Saturday that he would request early parliamentary elections to defuse the escalating political crisis. 

"We cannot get out of this crisis without early parliamentary elections," he said, reading a statement. He added he was not to blame for the country's deep economic and political woes. 

(With input from agencies)