Television reports said at least three people aboard the delivery van were allegedly killed when the concrete slab fell from the fourth floor of the Serendra hit it.
An INQUIRER.net reporter inside the newly-built SM Aura which is several blocks away from the condominium heard the loud blast and felt the floor shake.
The explosion caused panic among shoppers and diners in the area. An ambulance was seen speeding into the area.
As of this time, authorities have sealed off the street where the concrete slab fell. Police also stopped people from going near the site.
Television reports also said the blast caused damage to nearby establishments in the Market!Market! shopping center which is located just across the street from the condominium.