By Hugo Gye PUBLISHED: 07:28 EST, 19 April 2013 | UPDATED: 07:28 EST, 19 April 2013 Two young women found dead in mysterious circumstances are feared to have fallen victim to a deadly batch of party drugs nicknamed 'Dr Death', police revealed today. Oil rig worker Rachel Clayton and her partner Emma Speed were discovered at their home in Macclesfield earlier this month after a friend went to check up on them. It was initially believed that the women, who had been carrying out renovation work, may have succumbed to carbon monoxide poisoning, but that possibility was soon ruled out.
@highlight
Rachel Clayton, 34, and Emma Speed, 30, found dead earlier this month
@highlight
Toxicology tests reveal they had taken PMA, a drug similar to ecstasy
@highlight
Police warn about dangers of 'Dr Death' after it is linked to string of deaths
Killer: @placeholder, known as 'Dr Death', has been linked to a number of deaths of young people in recent months