As a property owner you have to deal with a lot of problems that you may not have considered before. Every property owner not living on their property has considered what they would have to do if someone broke into the house, but what about what you would do if squatters moved in.
The first thing to do is to define if they are squatters . This is something that depends on where you live, and you should acquire some free legal advise about your area to determine if they are trespassers or squatters. If they are trespassers you have a lot more legal actions you can take and the police can be called on them. In most cases if they have broken locks, windows or other property in order to enter the house they are considered trespassers, but to what extent it has to be proven they broke the property, is something else that changes between areas. There are two good ways to avoid this issue, the first one is to have someone move in as soon as possible to the residence, which will keep it from being an empty building and will bring in some revenue. The other option is to put up security camera around the house, because if you have video of them breaking into the house, you won’t have to worry about the distinction in the first place in a court of law.
If you can not prove that they are trespassers they may have some legal rights, after all possession is nine tenth of the law, and you will have some trouble on your hands. The longer they live there the more rights they have to the land. A good property manager will check empty properties everyday in case something like this happens in order to reclaim the property with ease. If it goes on too long and you can not call the police on them, file for repossession which will give you the legal rights to kick them out. Then, hire a professional eviction team to handle the physical confrontation with them. People who live on the streets regularly are strong, that is how they survive out there so don’t try to take them on by yourself.