The Delhi police on Tuesday claimed to have busted an illegal drug manufacturing lab in Greater Noida and arrested four foreign nationals. Those arrested have been identified as Nigerian national Eze Uchenna James (49), Alitumo Ifedi Shedrack (28), Eze Ibe Emeka Chibuzo, alias Iko, (56) and Kenyan national Ivo Osita, alias Usta, alias Osey (44), the police said. According to the police, the accused have been producing methamphetamine, a central nervous system stimulant that is mainly used as a recreational drug. The drug has a high demand in rave parties, the police said. Two of the accused, James and Shedrack, were earlier convicted in a drug case and have been out on a conditional bail. The police said the accused purchased a property in Greater Noida at a faraway place to avoid suspicion as drug-making results in the release of poisonous gases.