Firas Press reports about some serious Hamas infighting between the Al Qassam Brigades and the official Gaza security forces. These include kidnappings, beatings and public accusations of indecency.
Firas Press does very little original reporting, and usually directly rips stories off other Palestinian Arab sites. This story was copied from Palvoice.com, which is also Fateh.org - so it is hardly unbiased. Nevertheless, it does name some names, so it might have some validity.
Also at the same site is a story about a senior Hamas sheikh, 42 year old Mahmoud Abu Abdallah of Deir al-Balah, caught red-handed molesting a girl. The case was closed and hushed up when Hamas officials intervened.