"Modi is on the hitlist of terrorists...And in view of the blasts in Chennai today, additional security was provided to him during his visit to the state later in the day.
"Security was also tightened in the areas, where he addressed rallies (in Seemandhra). Certain areas were cordoned off," a senior police official said.
On the request of Modi's security detail, additional personnel were provided to him, he said.
Voting will be held in Seemandhra region of Andhra Pradesh on May 7.