Nattapol Teepsuwan, a co-leader of the People's Democratic Reform Committee (PDRC), revealed the attack on his home on his Facebook page at 2.20am Friday.
He said, “shortly after midnight, a person threw a pipe bomb into the house but luckily it did not explode. It could be the result of the ‘heart-cutting whistle’.
"This is one of reasons why I have to blow the whistle. I am different from you and certainly I’m not afraid and do not retreat like your boss. And there will certainly no violence.”
His wife Taya also posted about the incident on her Facebook page around 9am Friday. She said the bomb was not unexpected. It was the action of thugs who always respond with the violence.
There are so many people dead and injured. Is that not enough? she asked
Mr Nattapol and Mrs Taya on Wednesday afternoon blew whistles at Khunying Potjaman, former wife of Thaksin Shinawatra, after tracking her down at the fashionable Emporium shopping mall in Bangkok’s Sukhumvit area, causing her to flee.
Mrs Taya earlier posted on her Facebook that she had wanted to send a signal to Thaksin and caretaker Prime Minister Yingluck Shinawatra -- that if they still did not stop hurting Thailand, they would face the same pressure.
She said the blowing of whistles was not a violent act, but a social sanction, and could not be compared to burning the city, cheering when someone dies, or burning a coffin in front of the court.