An employer can terminate the services of any temporary employee without specifying any reason. There is no recourse on this matter, although in some cases, where something has happened which may be an offense under IPC or some other law, the employee may have cause to fight back.
Permanent Employee Termination
In the case where an employee is appointed permanently from day one, as in the case of most senior positions, the notice period is effective from day one. In those cases, the employer is liable to pay the notice period salary, and the employee can even file a case against the company for removing him/her without any reason and can claim damages for leaving the previous job and losing the new one.
Legal Implications of Unjust Termination
If an employee is terminated without giving any valid reason, the courts of law presume it to be an act of injustice, and later, even the company cannot explain or add reasons to justify their action. So, in some cases, termination without specifying the reason is a dangerous action for employers.
Therefore, in your case, unless full details are known, exact advice cannot be given.