Around six to seven unidentified men allegedly cut the hair of a 60-year-old sikh man and also threw acid on him in Bhogal area of south east Delhi, police said on Tuesday.
After the incident, tension prevails in the area, with hundreds of Sikhs staging protest demanding the arrest of the accused.
The incident took place around 7.30pm on Monday when Ranjeet Singh Thapar, who runs autorickshaw, was returning home from his work.
Thapar, who is said to be critical, has suffered burn injuries on his chest, stomach and private parts.
"Police have arrested one Soman Nayak in the case and a case has been registered in this regard. They are scanning the footage of CCTVs installed nearby area to identify the accused," said a senior police officer.
Officer also said that different teams have been formed to crack the case, adding that all accused would be arrested soon.
"When papa was returning home, around six to seven unidentified persons stopped him near a private hospital here and suddenly started thrashing him. Some minutes later, they cut his hair and then threw acid on his body," Priya, daughter of Thapar, said.
"He has suffered serious injuries on his body and is admitted to Intensive care unit (ICU) at a hospital. Police are doing nothing to arrest the accused. We don't now who attacked my father, he has no enmity with anyone," she said.
After the incident, the people of Bhogal, which is Sikh-dominated area, today staged protest against the incident and demanded immediate arrest of all the culprits.
Traders of Bhogal Market shut their shops to show their anger over the incident.
Security has been beefed up in and around the area to avoid any untoward incident.