The AIDWA delegation led by its Delhi unit president Maimoona Mollah visited Jewar to meet the women. The AIDWA is the women's wing of the CPI(M).
Armed robbers had on May 25 struck a group of eight persons travelling to Bulandshahr in a vehicle on the Yamuna Expressway, shooting dead a man and looting cash and jewellery.
Four women, who were travelling in the car along with as many men, alleged that they were raped at gunpoint after they tried to resist the robbery bid.
She said the women were in deep trauma and needed immediate medical support.
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"A medical board need to be constituted so that repeat medical examination could be conducted to bring out the truth," she said.
The Greater Noida police and medical officials had earlier maintained that no sexual assault was confirmed in the preliminary medical examination of the victims.
The AIDWA delegation also met the wife of the man who was killed by the robbers, and demanded the Uttar Pradesh government take care of her son's education.