The number of drug-related killings in the Philippines since Rodrigo Duterte became president two months ago on a pledge to wipe out the illegal drug trade, has reached around 2,000, fresh data has shown.

There has been popular support for his campaign, but the wave of killings unleashed since his election victory has alarmed rights groups and brought expressions of concern from the United States, a close ally of Manila.

As officials readied a publicity campaign to explain his fight against on narcotics, the Philippine National Police said that close to 900 drug traffickers and users had been killed in police operations from July 1 to Aug. 20, according to the data released Tuesday That was an increase of 141 people over a week, on average 20 people a day.