Detectives have cautioned a man in connection with an inquiry into a rogue batch of Superman ecstasy pills which killed two men in Ipswich.

Ipswich Star: Adrian LubeckiAdrian Lubecki

The 21-year-old was one of three people to be arrested in Ipswich after two Latvian men died within eight days of each other over the Christmas and New Year period.

Last month Polish national Adrian Lubecki, 19, of St Matthew’s Street, Ipswich, was jailed at the town’s crown court for five years and four months for being concerned in the supply of a Class A drug.

The lethal batch of ecstasy contained PMMA, a highly toxic substance used as a substitute for the less toxic MDMA.

The remaining two people suspects had been released pending further enquiries and answered their police bail on Wednesday.

Lucy Sheehan, a spokeswoman for Suffolk Constabulary, said: ““A 21-year-old man has been cautioned for possession of amphetamine – a class B drug - after being arrested on January 2 as police investigated the drugs-related deaths of two young men in Ipswich.

“Police carried out a full investigation into the circumstances of the deaths and three arrests were made during the enquiry in connection with supply of controlled drugs.

A 26-year-old man has been told he will face no further action.”

Justas Ropas, of Bramford Lane, Ipswich died on Christmas Eve after taking one and a half “Superman” tablets.

One of the 23-year-old’s flat mates had contacted Lubecki on December 23 and asked if he could supply some ecstasy tablets. They then went to meet him in Norwich Road.

Five ecstasy tablets were purchased for £5 each. They were triangular in shape, red and had a ‘Superman’ logo on them.

The men went back to their house in Bramford Road and Mr Ropas had consumed one and a half of the tablets

Gediminas Kulokas, died on January 1, the day of his 24th birthday, after being taken ill at his girlfriend’s flat in Provan Court.

After Lubecki’s arrest a stash of drugs containing 461 PMMA tablets with the “Superman” logo and 49 MDMA tablets with a snail logo were discovered hidden in the Norwich Road area.