The party's strongman in Salem district, arrested near his residence on June 4 and imprisoned in Vellore, was informed about his detention, they said.
Arumugam is the latest among several DMK leaders and former ministers, besides MLAs to face police, vigilance or anti-corruption bureau's action either on land grab charges or allegations of disproportionate assets, after the AIADMK government came to power in April last year.