NEW DELHI: A high alert has been sounded at all airports in the country, particularly those in Kerala and Tamil Nadu, following threats of a possible terror attack by Al-Qaida. The security alert was issued on Thursday morning after the Director of Trichy Airport in Tamil Nadu received an anonymous letter warning of an attack by Al-Qaida at airports or on aircraft in South India. The letter said about 10 Al-Qaida terrorists will break the security cordon and carry out attacks at airports. The airports that are placed on high alert are Chennai, Kochi, Trichy, Thiruvananthapuram and Coimbatore. The...