Philippines boxing icon Emmanuel 'Manny' Pacquiao says he took all kinds of drugs as a teenager but fully supports President Rodrigo Duterte, whose vicious anti-drugs campaign has led to the killing of more than 3,000 people, mostly users and pushers, in three months.
The blast occurred in the centre of Davao, close to one of the city's top hotels and a major university.
Duterte, the longtime mayor of the southern city of Davao, hypnotised millions with his vows of brutal but quick solutions to the nation's twin plagues of crime and poverty.
Dutere, 71, made a joke in reference to the brutal gang rape and murder of missionary Jacqueline Hamill at a Davao City jail back in 1989.
Manny Pacquiao's loss to undefeated American Floyd Mayweather Jr in their welterweight showdown in Las Vegas was met with tears, anger and accusations of foul play in his homeland of the Philippines on Sunday.
India figured in the top five markets for generating tourists for Singapore last year, the Singapore Tourism Board said.
The explosion, which destroyed the waiting area at the Davao City airport on Mindanao Island, struck at about 5.30 pm. local time.