The owner of the Pumphouse Pub in the Maritime Quarter told ITV News that armed police are on the scene blocking entry to the marina.
There's a police helicopter and armed police outside blocking the road. We haven't been asked to close the pub, but there are police and dogs on leads outside and nearby. The marina is also blocked off and no boats are allowed in or out.
The Grape and Olive restaurant at the top of the Meridan Tower has tweeted to say it's closed due to an incident.
Restaurant closed due to incident all bookings cancelled sorry for any inconvenience
More top news
The Royal Institution of Chartered Surveyors says it's essential the UK Government and industry work together to get the best deal for Wales
Sarah McHarg was diagnosed with Asperger's Syndrome when she was nine years old. This is is her experience of living with autism.
Letters written by Jackie Kennedy to Welshman David Ormsby-Gore go to auction at Bonhams today. They're expected to sell for up to £150,000.