Croatian war crimes included the Gospić massacre, the Sisak killings in 1991 and 1992, and others, which were likewise prosecuted by Croatian courts or the ICTY. Another infamous instance of war crimes, in what would later become known as the "Pakračka Poljana" case, committed by a reserve police unit commanded by Tomislav Merčep, involved the killing of prisoners, mostly ethnic Serbs, near Pakrac in late 1991 and early 1992. The events were initially investigated by the ICTY, but the case was eventually transferred to the Croatian judiciary. More than a decade later, five members of this unit, although not its commander, were indicted on criminal charges related to these events, and convicted. Merčep was arrested for these crimes in December 2010. In 2009, Branimir Glavaš, a Croatian incumbent MP at the time, was convicted of war crimes committed in Osijek in 1991 and sentenced to jail by a Croatian court.