But how can they fire me without mentioning any reason, they were happy with my performance and I got a good feedback time to time.

Hi, not sure if there is any action I can take against the employer?

Hi, I am a IT consultant and was employed by IT firm on a permanent basis with good pay but due to the fact that I was on bench for quite some time and bit worried about my career I was looking around for other opportunities. I got an permanent offer from other IT firm who promised me a good work as they won recently a bid, but after few phases of project the project went on hold and my customer was not quite interested from the beginning to implement my solution as they were lacking of budget and infrastructure and my company didn't do any ground work and took me on board and 2 months later they asked me to look out for other opportunities. I was shocked as I left my permanent job where I worked for more than year and quite safe and joined this organization only on the grounds of good work they promised and I even didn't even bothered about money also. Buggers played with my career. They just issued a letter leaving the company and given a week notice as I am in my probation. I pray to god this situation never come to anyone.