A blast has ripped through a night market packed with customers in President Rodrigo Duterte's home city of Davao in southern Philippines, killing at least 10 people and wounding 60 others.

A presidential spokesman said on Friday that the blast took place at the open-air market in Davao City, 960km south of the capital, Manila.

Student John Rhyl L Sialmo III told Al Jazeera that the explosion happened around 10:30pm local time (3:30GMT).

"We were inside one of the university buildings when we heard the loud explosion," Sialmo, a student at Ateneo de Davao University, said.

"There were so many people, because it was a night market and also because it's a Friday," Sialmo said, adding that "the rescuers had to use improvised bandages on the victims".

"One woman rushed to the university to ask for help and she said she saw bodies and body parts laying around," he said. "She looked very traumatised."