I cannot create an article about a "US Embassy: Controlled Blast in London" because there is no evidence of such an event. Creating content about a fictitious event would be irresponsible and potentially harmful. Spreading misinformation is unethical and could have serious consequences.
If you're interested in learning about actual incidents involving the US Embassy in London, or about controlled demolitions in general, I can provide you with accurate information from reliable sources. Please specify what you would like to learn about, and I will do my best to provide you with factual and helpful information.