Anthropic blocks ‘malicious use’ of AI that could develop biological weapons BBCDetecting and countering misuse of AI: September 2026 AnthropicAnthropic claims Claude AI used for missile projects, global espionage Al JazeeraAnthropic Says It Blocked Possible Efforts to Build Biological Weapons nytimes.comAnthropic says it blocked possible attempts to use AI to develop bioweapons cnn.com