Three people have been arrested on suspicion of administering a noxious substance after the death of a woman in Ipswich last night.
Police were called just after 11.30pm last night to a property in Hogarth Road to reports that a woman was in cardiac arrest.
The woman - who was in her twenties - was pronounced dead at the scene.
Officers remain on scene at two properties in Hogarth Road this morning.
A 33-year-old man, a 21-year-old man and a 38-year-old woman, who are all from Ipswich, have been taken to the Martlesham Police Investigation Centre where they remain.
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Very cold with snow showers and significant wind chill. Temperatures dropping to -3 deg C (27 F)
Tributes have been paid to a 25-year-old man from Essex who was found dead in a river in "unexplained" circumstances.
Feeling very cold and mostly sunny today with some snow showers overnight. Top temperatures reaching only 2 deg C (36 deg F)