Belgium's prime minister says terror attacks in Brussels this morning are a "dark day" for the country, as local media report more than 30 people have been killed in terrorist attacks.

The city's metro system says at least 20 people have died in a bombing at Maelbeek station, near the EU headquarters.

Local media say 14 people were killed in an explosion at the city's main airport before that.

Helen Vaughan compiled this report hearing from eyewitnesses to this morning's attacks.