But when the club were informed about the incident the police were called in.
"I did not tell anyone about it because I did not want anyone to worry.
"Not even Rick Parry and the chairman David Moores knew," admitted Houllier. "But what has happened does not affect my love for the city and my affection for the team and the fans.
"Those fans, 2,000 of them, travelled here to support us and they were fantastic. Their voice was heard. What has happened does not affect my passion for my job or my enthusiasm for it.
"The fans have been fantastic, the vast majority of them know what we are doing and they know what a difficult season it has been with injuries."