Preliminary results showed that Warner, who resigned as national security minister in April, had received 11,148 votes against 4,534 for Ameen.
The Elections and Boundaries Commission said that 27,045 people were eligible to cast ballot in the by-election.
Warner, the former Member of Parliament for Chaguanas West under the United National Congress (UNC) banner, formed his own party, the ILP, after his bid to seek re-election as a UNC candidate was rejected.
In a report carried by the Trinidad Express Warner was quoted as saying in his victory speech “It was not easy but the voice of the people is the voice of God.”
“Tonight a new era has dawned.”
Up to the point of Warner’s victory speech the results showed he had collected 69 per cent of the votes with 12,631, compared to the UNC’s Ameen 5126, with just a few polling station count outstanding, the Trinidad Express said.