British electronic music pioneers Massive Attack were stunned to discover that the public display of a Palestinian flag at a 29 July concert in Singapore had prompted an indefinite ban on their return to the city‑state.

The group posted on Instagram on Sunday that both members were detained, isolated and interrogated separately by Singapore police, and that some were even searched in hotel rooms while their passports were temporarily confiscated.

During the show, Del Naja and Grant Marshall held up the flag and shouted “Free Palestine,” feeding into audience chants that the authorities said could contravene Singapore’s strict laws on public expressions of foreign political symbols and on political discourse at public events.

The Singapore authorities say the two musicians will not be allowed to re‑enter the country or perform there again. They were also warned of possible offences under the Public Order Act and the Public Entertainments Act.

Del Naja had a prior arrest in London earlier this year when he displayed a pro‑Palestine sign at a protest, the authorities said. Those incidents underscore how the city‑state keeps a tight watch on public speech in a multicultural context that it believes mid‑sts the social fabric.

Supporters of the band were quick to rally behind the musicians. One fan wrote, "Many of us in Singapore have learned to be careful with how, when, and what we say," adding, "Thank you for standing with Palestine...and for showing us that integrity can still take centre stage."

Singapore’s policy on the Israel‑Gaza conflict remains firm; the Ministry of Home Affairs issued a warning in 2023 against displaying or wearing foreign national emblems in relation to the war, and fines have been levied for unauthorised rallies in support of Palestinian causes.

Massive Attack announced that they were “proud to have made the impromptu expression with fans in Singapore, who clearly felt a moral imperative to show solidarity with the people of Palestine.” The post, liked by 146,000 people, was flooded with supportive comments from fans worldwide.

With the band on a world tour, next week’s shows in Australia mark the conclusion of the Asia leg of their tour, while the BBC has reached out for a statement from Singapore police. Meanwhile, the Dutch intriguing incident raises questions about the limits of artistic expression when it collides with governmental regulations.