According to Reuters, the Indian High Comission accused the security services of turning away "hundreds" of guests at the event and of "threatening’ some New Delhi's.
The allegations came after similar reports a few days earlier from New Delhi, where guests arriving at a High Commission of Pakistan event were allegedly harassed by Indian security personnel.
Similar harassment by Indian security officials had also been reported amidst Pakistan Day celebrations hosted by the High Commission of Pakistan in New Delhi in March.
According to the statement, Pakistani security agencies "even used a forklift truck to remove the cars of some attendees" of the Saturday event. India said about 300 guests in total were turned away from attending Saturday's iftar dinner at the hotel.
The Indian High Commission, asking Pakistan to investigate, alleged that some of its officials and diplomats were "jostled, pushed, abused, aggressively threatened with bodily harm" and in some cases had their phones "snatched" by Pakistani security officials.
"The disappointing chain of events on June 1 not only violate basic norms of diplomatic conduct, but are against all notions of civilised behaviour," the Indian High Commission said in a statement.