A US hedge fund's rapid rise and near-collapse has sent shockwaves across global markets. The fund, Situational Awareness, is based in San Francisco and was founded by a former OpenAI researcher. It had been performing well, reportedly up over 400% this year, but its investments recently soured.

The fund was forced to sell its public holdings to a larger rival after facing margin calls from lenders. This dramatic turn of events has deepened investors' anxiety about the risks of relying on AI. Further details about the situation are available from CNN, which has been following the story and its implications for global markets.