The houses belonged to Phungzaphang Tonsimg, Minister-in charge of Family Welfare, and five MLAs, including Manga Vaiphei of Henglep constituency and Vungzagin Valte of Thanlom, a police officer said.
It was yet to be ascertained as to which were the three other legislators whose houses were burnt late tonight.
One of the arsonists was hospitalised after sustaining injuries while trying to set fire to a house, the officer added.
Three tribal students' organisations, which had called a 12-hour bandh today in the hill districts to protest against the passing of some Bills in the Manipur Assembly, are suspected to be behind the arson, the officer said.
