Former members of parliament and political observers told This Week in Asia that such a conflict between the parties reflected a more hotly contested ground ahead of a general election that must be held by November.
The incident, which has seen cabinet ministers in the usually calm political landscape weigh in, surfaced last week when PSP volunteers alleged they were harassed by their PAP counterparts in a walkabout in Bukit Gombak, a town in the west of Singapore.
A PAP member of parliament later countered, saying that PSP volunteers had started the confrontation and even slapped one of her volunteers and pulled another by his shirt.
Police have confirmed they are investigating the case after a report filed by a PSP volunteer.
Senior Minister of State for Culture, Community and Youth as well as Trade and Industry Low Yen Ling, the MP for the area, accused the PSP of twisting the facts. One of her volunteers last Thursday posted two videos of the incident.
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