The coastguard has been assisting police with an incident near Ipswich.
Emergency services were called to an incident at about 3.45am on Wednesday.
A Coastguard spokeswoman said crews have been responding to the incident alongside Suffolk police.
The Coastguard Rescue Team from Felixstowe, the coastguard search and rescue helicopter from Lydd and RNLI lifeboats from Harwich have all been sent out.
The coastguard helicopter was seen circling over the River Orwell close to the Orwell Country Park and Orwell Bridge.
Suffolk police has since confirmed that they are searching for a missing 43-year-old man.
Edward Osborne was last head from at about 5.30pm on Tuesday, and was reported missing later that evening.
Police are conducting their searches for the missing Framlingham man around the River Orwell and surrounding coastline, with the assistance from the Coastguard and Suffolk Lowland Search and Rescue.
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