The Scottish Fire and Rescue Service said they mobilised seven fire engines, two height appliances, a water rescue team and rope rescue team to attend an incident at the River Esk on Thursday morning just after 8am.
A witness said they saw six fire engines and a water rescue vehicle with an inflatable boat in Musselburgh on Thursday.
Sirens were ‘blazing’ and the emergency vehicles were seen heading down Ferguson Drive towards the River Esk.
A spokesperson for the Scottish Fire and Rescue Service said: “Alongside emergency service partners, we attended an incident at the River Esk near Ferguson Drive, Musselburgh this morning.
“Operations control mobilised seven fire engines, two height appliances, a Water Rescue Team and a Rope Rescue Team to the area after the alarm was raised at 8.19am on Thursday 20 January.”
The incident comes as the Scottish Environment Protection Agency and East Lothian Council are working together to investigate a pollution incident in the River Esk.
Police Scotland also attended.