Some 30-50 thousand Turkish forces entered Iraq on 14 May in response to an appeal by the Kurdistan Democratic Party for support in its offensive against the PKK. On 19 May, the KDP launched a military operation to evacuate all PKK fighters from their capital in Arbil, which turned into a major battle in which 53 KDP and 58 PKK fighters were killed. In response the PKK ordered 4 suicide bombings from 1 to 11 June which resulted in the death of 55 KDP fighters By 7 July, when Turkish forces withdrew, over 2,000 PKK and at least 200 KDP forces had been killed.
More than 30,000 troops took part in the initial operation. Turkey announced fatalities at a total of 114 personnel made out of 14 commissioned officers, four non-commissioned officers, 75 soldiers and 21 village guards. Turkey announced the injured at a total of 185 personnel made out of 24 commissioned officers 17 non-commissioned officers, 338 soldiers and 48 village guards. Turkey announced the total number of militants neutralized at a total of 3,145 with 2,730 being killed and 415 being captured live or injured.
Iran: The Iranian government condemned the invasion "as not only a violation of all international laws but the sovereign rights and territorial integrity of the Iraqi Muslim nation" and denounced Turkish claims of Iranian support for the PKK as "a joint conspiracy by the Turkish military and Israel."