First, on-site security at Garfield Towers has been increased.
The Housing Authority also tells us they're installing a video surveillance system.
The hope is by next week, cameras will be pointed towards the common areas of Garfield Towers, which is where the arsons have taken place.
The biggest development in this story is the reward to catch the arson or arsonists has increased from $5000 $10,000.
"We want some answers," said Terre Haute Housing Authority Executive Director Jeff Stewart. "We want to bring the parties responsible for the may fire to justice, and we want to see some resolution to that."
Stewart says the residents of Garfield Towers, made up primarily of elderly or disabled persons, have been surprisingly resilient through all of this.
However, the second arson on Sunday night brought back bad memories of the first arson in May, when one person was killed and several others hurt.