<l:1,74>Ecoterrorists<e> and <l:1,75>God Soldiers<e> can nano-attack, which destroys all <l:6,65>improvements<e> in the infected <l:6,104>city<e>. Any city trading with the infected city has a 20% chance of becoming infected in the next turn. These attacks hava a 25% chance of success; however, if the attack fails the perpetrator also has a 25% chance of being caught and killed. The nano-attack costs 4,000 gold.