"The meeting lasted 20 minutes. Vaiko submitted a petition to Prime Minister regarding the killing of 20 Tamils," a party statement here said.
He urged Modi to ensure "justice" in the matter in which 20 persons were killed by Andhra Pradesh security forces, the statement said.
Vaiko referred to the NHRC recommendation that CBI should probe the incident, which happened near Tirupati, against which the Andhra Pradesh government had secured a court stay.
Vaiko also reiterated an earlier demand of interlinking of rivers, the release said.
The MDMK chief met Modi at his office in Parliament building.
