Janesville police are investigating an apparent home invasion in the 500 block of South Main Street Monday night. Police say the suspects were possibly armed with handguns. The two occupants of the residence reported the theives knocked, but when the residents did not answer, they forced their way in and demanded money. The suspects physically assaulted the residents who sustained injuries to their head and face. They were treated at the hospital and released. The robbers took electronic items. Police say this does not appear to be a random incident.