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As the AIADMK sympathisers attempted to break the security cordon at Hosar Road Junction near the Tamil Nadu-Karnataka border, police pushed them back with 'mild' cane-charge.
The activists holding AIADMK flags shouted slogans hailing Jayalalithaa, police said.
Police have been closely checking vehicles with Tamil Nadu registration at the check post at Attibeli on the border.
AIADMK supporters had gathered at the border but were stopped by the police.
Bus services between Hosur and Bangalore have been suspended for a couple of hours as a precautionary measure.