Three international airports in India’s southern state of Kerala – Kochi, Thiruvananthapuram and Kozhikode – have stepped up security after a 21 March threat of attacks by Sri Lankan rebel group, the Liberation Tigers of Tamil Eelam (LTTE). Last month, two light aircraft of the LTTE bombed Sri Lanka’s main Revenue Department building near its Air Force headquarters killing at least two persons before the aircraft were brought down by the military. Colombo International Airport was closed and flights diverted to India.