New Delhi, Aug 4 - Terrorists are getting 'more and more aggressive' and can resort to using chemical weapons to cause maximum casualties, Defence Minister A.K. Antony said Tuesday, adding that the Indian armed forces will prepare to counter any such attack.

'Terrorists are getting more and more aggressive in their activities the world over. They are adopting newer techniques and technology in their mode of operation,' Antony said here while releasing the national guidelines on the Management of Chemical Terrorism Disaster.

The guidelines, compiled by the National Disaster Management Authority (NDMA), have been prepared by experts from various streams, academia and scientific institutions.

Experts from the Armed Forces Medial Services and the Defence Research and Development Organisation have also made significant contributions in the formulation of guidelines.