"We are not sure how many more (alleged killers) are there and whether they are (acting) in groups or not.
"We appeal to the CM to strengthen the police protection given to Hindu leaders," state BJP president Pon Radhakrishnan told reporters here.
BJP state general secretary V Ramesh, alias 'Auditor' Ramesh, was murdered in Salem earlier this month.
Hindu Munnani state president Vellaiyappan was among a series of Hindu leaders either killed or attacked in the past one year, party officials said.
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Describing as "unfortunate" DGP K Ramanujam's statement yesterday that not all murders or attacks had a communal motive, Radhakrishnan said the former was just repeating the reports filed by local inspectors.
Meanwhile, a report from Salem said CB-CID DGP Narendra Pal Singh has reviewed the probe into the Ramesh murder case with police officials.
The meeting, attended by, among others, CB-CID IGP Manjunatha and SP Anbu, lasted three hours.
Manjunatha told reporters after the meeting that those behind the attacks on the leaders would be caught soon.