In pictures: Beirut blast aftermath — destruction, chaos and protests

Two immense blasts shook Beirut and the surrounding areas of the Lebanese capital, prompting panic as residents rushed to safety. "I have never in my life seen a disaster this big," Beirut's governor told local TV.

The explosions, centered in Beirut's port region, were felt throughout the capital. Even residents in the city's outskirts reported hearing the blast, with some saying their windows were shattered.

Lebanon's Health Ministry said at least 100 people were killed and more than 4,000 others were injured.

Prime Minister Hassan Diab said that a large stockpile of 2,750 metric tons of ammonium nitrate in a warehouse at the port had caused the second, larger explosion. "It is unacceptable that a shipment of 2,750 tons of ammonium nitrate has been present for six years in a warehouse, without taking preventive measures," Diab said.

More than 30 Red Cross teams raced to the scene, with many locals lending a hand to aid rescue efforts. Hospitals warned that they were quickly filled beyond capacity — and called for blood donations as well as generators to help keep the electricity on.

The blasts struck with the force of a 3.5 magnitude earthquake, according to Germany's geosciences center GFZ. Residents in Cyprus, some 110 miles (180 km) across the sea from Beirut, reported hearing and feeling the blast.

DW's Bassel Aridi said people were using social media to try to track down their loved ones after the explosions. Aridi also visited a hospital in Beirut after the blasts. "What I saw in the hospital was so dramatic. All the hospitals have announced that they are totally overloaded."

Lebanese authorities fear many more people are buried beneath rubble. President Michel Aoun scheduled an emergency Cabinet meeting for Wednesday and said a two-week state of emergency should be declared.

The devastating blasts come as Lebanon experiences severe economic turbulence, with many people taking to the streets in recent months to protest the financial situation. Prime Minister Hassan Diab declared that Wednesday would be a national day of mourning for the victims of the explosion.

Thousands of protesters took to the streets four days after the explosion, blaming the blast on government corruption and mismanagement boiling. Protesters demanded government resignations and fresh elections, with many occupying government ministries. Police responded with tear gas.

Information Minister Manal Abdel Samad became the first government minister to resign in the wake of the blast, five days after it took place. "After the enormous Beirut catastrophe, I announce my resignation from government," she said in a statement carried by local media. She apologized to the people of Beirut for failing them.