I accepted an offer from a recruiter but they're not responding to my emails. What does this mean and what should I do?

I received an offer letter from a tech startup and I have to join in next 5 days. Now when I am trying to contact them, they are non-reachable and are not responding to my mails also. What should I do in such situation? Should I consider looking for other opportunities?

There could be any number of reasons why the recruiter is not responding to your emails. Perhaps they are busy with other candidates, or there could be a problem with the position that you were offered. In any case, it is always best to follow up with the recruiter to ensure that everything is on track. If you are unable to get a response from the recruiter, you may want to consider looking for other opportunities.