Police believe the deaths of three men could be linked to a dangerous batch of drugs.
Suffolk Police were called to reports that a man, believed to be in his 20s, was found seriously unwell in Chestnut Close, Rendlesham at 7.10am.
He received treatment at the scene but was pronounced dead.
At 9.40am two men were reported as unwell at Provan Court, Ipswich.
One man, believed to be in his 20s, was pronounced dead at the scene. The other was taken to hospital in a serious condition.
Police are investigating the deaths and believe they could have been a result of taking ecstasy.
Detectives believe their cases may be linked to another drugs related death on Christmas Eve. A man in his 20s died on Bramford Lane, Ipswich.
Chief Inspector Steve Denham said: "As well as it being illegal to sell and buy drugs, it can also be very dangerous as we have sadly seen with these tragic deaths.
"We would urge everyone not to be tempted to take illegal drugs, you don't know where they have come from, what they are made up of, or how your body will react to them.
"If you have been offered drugs in the Ipswich area over the past few weeks, in particular ecstasy, we'd urge you to contact us with any information so that we can find those responsible and remove these dangerous drugs from the streets."
Anyone with information is urged to contact police on 101 or call Crimestoppers anonymously on 0800 555 111.
