Pua, who was not home at the time, said her sister witnessed the incident.
“My sister informed me that a blue car with tinted windows was parked outside the house for about 15 minutes.
“A man in his 20s came out of the car, walked towards the house and splashed red paint at the front door.
The incident happened at 10.30am. She said her sister lodged a police report.
Pua, who has been speaking out against illegal factories in Banting and Jenjarom, suspects her activism had rubbed some parties the wrong way.
She declined to comment further, saying that police investigation is underway.
However, Pua believed that she was the target and not her sister.
“I worry about my children and hope the police can catch the culprits and bring them to justice soon,” she said on Sunday (June 30).
Pua added that the incident should be a wake-up call to the authorities about the safety of environmental activists.
“The rakyat feels hopeless because there is pollution everywhere and not much is being done to hold the parties responsible.
“Meanwhile, the ones doing their part are being harassed in an attempt to silence them,” she said.