Grasshopper (?) Invasion

Help!

As of today my flat is being invaded by grasshoppers.

This morning when I opened the blinds I saw what I thought were two cockroaches running along the balcony. They disappeared in a corner by the door to the balcony. This afternoon I saw something out of the corner of my eye crawling across the floor inside the windows. I thought it was a cockroach too. Its body was shaped like one and it crawled like one. But when I got closer I saw some crazy head and large back legs. And then it started jumping. It was a grasshopper. At least I think it is. But why would grasshoppers move into my flat? I'm on the 3rd floor and I don't even have any plants. Maybe it is really some freaky type of roach?

I got rid of the two I saw and was pretty sure these were the two from the balcony in the morning, especially since they were found just inside near where I had seen them just outside. A couple of hours later another one was crawling past. I got rid of it too. Since then there have been two more. That is 5 (so far) inside my flat in one day. Before today I never had one in my flat her or even saw one around.

Is this a common problem in Bahrain?
How do I get rid of them?!