PETALING JAYA: Two students from higher learning institutions who were arrested in connection with the attack on the Ulu Tiram police station in Johor last week were released unconditionally yesterday.

PUTRAJAYA: Police are investigating if the recent attacks on the Ulu Tiram and Dato Keramat police stations as well as the failed attempt by two men to trespass on Istana Negara grounds were random incidents or coordinated.