Authorities in the Philippines seized suspected methamphetamine estimated to be worth more than one billion pesos (£14.6 million) and arrested a Chinese man, as the president’s crackdown on illegal drugs continued in his final months in power.

Philippine Drug Enforcement Agency chief Wilkins Villanueva said about 352lb (160kg) of the suspected stimulant, known locally as shabu, was discovered in a house in Valenzuela city in metropolitan Manila after the arrest of the Chinese suspect and his Filipina companion by law enforcers who pretended to be drug buyers.

If the seized substance, some packed in tea bags, turns out to be methamphetamine, it will be the largest illegal drug haul so far this year.

Tuesday’s raid was the latest in a series of anti-drug operations across the country this month that have led to the arrest of 11 suspects and the confiscation of a large amount of methamphetamine, Mr Villanueva said.

Philippines Drugs
Agents place tags on bags of suspected methamphetamine seized at a house in Valenzuela city, Manila (Philippine Drug Enforcement Agency Public Information Office /AP)

About a week ago, police and anti-drug agents seized 132lb (60kg) of methamphetamine with an estimated street value of more than 400 million pesos (£5.8 million) in a raid in Marilao town in Bulacan province near Valenzuela city, police said.

“We told you to stop but you’re just so hard-headed,” Mr Villanueva said at a news conference, addressing drug dealers. “We’ll get to all of you, just wait.”

President Rodrigo Duterte launched a deadly crackdown on illegal drugs at the start of his six-year term in 2016.

The campaign has led to the arrest of thousands of mostly petty suspects and the killing of more than 6,200 others in mostly police-enforced operations that have alarmed Western governments and human rights groups.

The killings have sparked an investigation by the International Criminal Court.

Mr Duterte has denied that he condones extrajudicial killings but has openly threatened drug suspects with death. He has often encouraged police officers to shoot suspects who resist arrest and threaten them.

Mr Duterte, a former mayor who made a name for himself with an extra-tough approach to criminality, won the presidency on a vow to eradicate illegal drugs in about three to six months.

After failing to fulfil that promise and acknowledging that he underestimated the extent of the country’s drug problem, he vowed to press on with his crackdown until the end of his term in June.