A massive police operation is underway in Singapore after the leader of the Jemaah Islamiyah network here, Mas Selamat Kastari, escaped from detention. He is not known to be armed and is one of Singapore's most wanted men. Security experts said the escape was embarrassing for a country that prides itself on tight security. The escape sparked an unprecedented manhunt in the small island and a rare apology from the government, who blamed a "security lapse". But few further details of his escape have since been released. The superintendent of the Whitley Road Detention Centre has been sacked over security lapses that led to the escape of Jemaah Islamiyah detainee Mas Selamat Kastari on February 27. His deputy has been demoted, with a corresponding pay cut.