"During the shoot, heated argument ensued between the two groups, which turned into a scuffle and someone set Sahi Ram's car on fire," said a senior police official.

Soon after the incident, AAP volunteers reached Govindpuri Police Station and demanded registration of an FIR against BJP supporters alleging that they acted at the behest of an influential BJP leader from the area.

Senior police officials said that they will register cross FIRs in this connection under sections of rioting and other relevant sections.

"We are waiting for statements from both the sides following which we will register cases. Both the parties have levelled allegations against each other, we are investigating the case. As many as 12 persons were injured from both sides," said Deputy Commissioner of Police (southeast) Mandeep Randhawa.

In a statement, AAP alleged those involved in the attack were supporters of BJP MP Ramesh Bidhuri. "It is shocking that a mob led by the MP's nephew attacked the AAP volunteers in broad daylight when a TV news channel was conducting a debate in the DDA park at Tuglakabad."

On the other hand, Bidhuri accused AAP supporters of unleasing the violence and rejected allegations that his supporters were involved in the clash.

"AAP workers set the car on fire to blame BJP. AAP workers started the clash," Bidhuri charged claiming a number of BJP workers were injured in the clash.

Police said they were investigating the incident and are yet to ascertain who put on fire the car.

AAP leader Ashutosh accused the police of not taking action against the culprits under pressure from BJP.

"The violence unleashed by BJP on AAP volunteers is a clear indication that it wants to vitiate the peaceful atmosphere in the national capital ahead of the Assembly polls."

The party claimed at least 10 AAP volunteers had to be taken to the AIIMS trauma centre for treatment.

Asked about AAP's allegation, Delhi BJP chief Satish Upadhyay said he was not aware about the facts.

Aam Aadmi Party later also released two videos. One purportedly showed the car burning in the middle of a busy street while an AAP worker who was allegedly injured in the scuffle was caught on camera in another.

Meanwhile, rejecting BJP's claims vis-a-vis the clash, AAP convener Arvind Kejriwal said the attack shows the saffron party's "desperation".

"BJP says our volunteers beat themselves up so mercilessly that they had to be admitted in trauma centre. Why? To defame BJP. Believable?" Kejriwal said in a post on micro-blogging website twitter.com.

"BJP losing Delhi. Signs of their desperation. With the kind of violence they did today, their margin of defeat would further increase," he added.

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