The Delhi Police has transferred the case of alleged black-marketing and hoarding of oxygen concentrators in which over 500 machines were recovered to the Crime Branch, officials said on Saturday. <br /> <br />On Friday, police recovered 105 oxygen concentrators during raids at two upscale restaurants in the Khan Market area and arrested one person. <br /> <br />Police on Thursday recovered 419 oxygen concentrators during raids at a restaurant and a farmhouse in south Delhi and arrested four men.
