A boy has been taken to hospital in a serious condition after an incident in the water in Cardiff Bay.
The Ambulance Service said it was called just after 1.45pm this afternoon near the river in Butetown, Cardiff.
An eyewitness has told ITV News a group of people were seen jumping into the water near Stuart Street.
Police were also in attendance.
“We responded with a Rapid Response Vehicle, an Emergency Ambulance and a High Dependency Unit vehicle and a young male adult has been conveyed to the University of Wales Hospital in a serious condition.”
Thousands of visitors are expected in Cardiff Bay over the weekend to see the warships which arrived for the Nato Summit. Meet the Forces Day will take place on Sunday between 11am and 6pm. The public will get the chance to go onboard some of the six naval ships from the UK, France, Latvia, Lithuania, The Netherlands and Norway. There will also be tanks and replica RAF planes like the Red Arrow which arrived on Saturday.
Visitors and locals in Cardiff this weekend will get a taste of the seaside as the Cardiff Bay urban beach returns for a second year.
It follows the huge success of last summer's event when a quarter of a million people visited the attraction at Roald Dahl Plas.
The event will run until August 31st.
"Urban beaches are firmly established in major European cities such as Paris, Berlin and Madrid so it's great that residents and visitors to Cardiff have another good reason to cancel this year's holiday plans and soak up the sunshine in the heart of Cardiff Bay instead."
Today is the final day of this year's Cardiff Bay International Food and Drink Festival. Thousands of visitors have flocked to the event since it opened on Friday.
Local, national and international producers have set up stalls at the festival to showcase their products.
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Nearly 1,000 fundraisers dressed in festive costume ran 5km around Cardiff Bay to raise money for the charity Welsh Hearts.
Hundreds of Santas and elves are running around Cardiff Bay. It's all to raise money for Welsh Hearts. Participants are running, walking or jogging the 5km course.
Ambitious new plans have been put forward to further regenerate parts of Cardiff Bay.
If they get the go-ahead, Wales could see a Blue Flag beach in the heart of our capital city, a 'floating theatre' and new areas for housing.
Artists' impressions showing how Cardiff Bay could look in future have been revealed.
A masterplan for the further regeneration of the area has been drawn up by the group Imagine Cardiff, with proposals including a new bus and train station and a 'floating stage' in the water.
The main proposals put forward for Cardiff Bay are:
A new 2km 'Blue Flag' beach in Cardiff Bay
A residential area called Baltimore Village in the Bay, with affordable housing
A Cardiff tram network - an idea widely discussed previously
Two wetland reserves on the Rivers Taff & Ely
A Bay water theatre - or 'floating stage'
The Imagine Cardiff group is made up of Cardiff residents and a group of professionals with various skills and expertise.
Click here to see full details of their proposals.