British trip-hop band Massive Attack has said its members were detained by police in Singapore after a concert last week, during which a Palestinian flag was unfurled on stage. Authorities said two band members were issued with stern warnings and barred from re-entering Singapore. Massive Attack, comprising Robert Del Naja and Grant Marshall, was performing with a live backing band and guest vocalists, including Elizabeth Fraser of the Cocteau Twins. Massive Attack said its encounter with police in Singapore was a “surreal experience” and a “reminder of the importance of defending universal human rights and freedom of expression”. Del Naja was arrested on suspicion of showing support for a proscribed organisation.