A 34-year-old Thai woman and a local man, 33, were arrested at a Hong Kong music festival over the weekend for allegedly possessing illegal drugs and drug-taking equipment, police said on Monday.

The pair were seen acting suspiciously at the S20 Songkran Music Festival, held on Saturday and Sunday at the Central Harbourfront.

Police said officers found small amounts of suspected heroin and cocaine, as well as equipment or items suspected to be used for smoking drugs.

The drugs had a market value of about HK$2,400 (11,300 baht), police estimated.

Further details were unavailable.

A police spokesman said: "They were arrested during the two-day show over the weekend at the venue. But there is no information as to whether they knew each other."

The two suspects were still being held for questioning as of Monday afternoon.

The S20 Songkran Music Festival was held for the first time in Hong Kong this year and listed as a mega event on the government's website.

The two-day event combined elements of Thailand's Songkran water festival with a roster of international artists.