Michael Boateng and Hakeem Adelakun are the third and fourth people charged in connection with the investigation into an alleged international illegal betting syndicate.
Chann Sankaran and Krishna Sanjey Ganeshan were charged on November 28 and remain in custody.
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Social deprivation and suffering from prolonged health problems were the main factors inflating emergency department attendance.
The hills are likely to see the most snow, with blizzard conditions at times too.
The victims, aged between 2 and 29, were found in a house in Perris, an hour’s drive south-east of Los Angeles.