The Kurdistan Workers' Party (PKK) has claimed over 20 killings of police and soldiers since a devastating suicide attack three weeks ago in a mainly Kurdish town.

Around 390 PKK militants have also been killed in Turkish retaliatory raids, according to the Anatolia news agency.

- July 20: A bombing in Suruc near the border with Syria kills 32 people. Prime Minister Ahmet Davutoglu says it appears to be the work of IS militants. Many Kurds say Ankara has been complicit with IS jihadists.

- July 22: The PKK claims the killing of two Turkish policemen to avenge the Suruc attack.

- July 23: Jihadists inside Syria open fire on a Turkish army border post. Turkish tanks fire on IS positions in Syria.

- July 24: Turkish fighter jets hit IS targets inside Syria for the first time. Later air strikes target PKK militants in northern Iraq.

IS members, Kurdish militants and Marxists are arrested in dawn raids in Istanbul and other cities. The number held has since climbed to more than 1,300.

- July 25: Turkish air strikes intensify against IS jihadists in Syria and PKK militants in Iraq.

The PKK's military wing says conditions for maintaining a ceasefire with Turkey "have been eliminated".

- July 28: President Recep Tayyip Erdogan says "it is not possible" to pursue the peace process with the PKK.

NATO expresses "strong solidarity" with Ankara, but Germany voices concerns over attacks against the PKK.

- July 29: Turkey gives the US a green light to use the strategic Incirlik air base for strikes against IS positions.

- August 2: Two Turkish soldiers are killed and 31 wounded in a suicide attack on a police station blamed on Kurdish militants.

- August 5: A US armed drone bombs a target in IS-controlled northern Syria, in the first such air strike by a US aircraft after taking off from Turkish territory.

- August 9: The US for the first time deploys half a dozen F-16 warplanes and 300 troops to Incirlik to help operations against the IS.

- August 10: In a wave of attacks, four Turkish police officers are killed in a roadside bombing and a soldier dies when militants attack a military helicopter in separate incidents in Sirnak province.

In Istanbul, a suspected suicide bomber detonates a car bomb at a police station, wounding 10. A senior policeman dies of injuries suffered in ensuing clashes that also claimed the lives of two militants.

Two armed women launch a gun attack against the US consulate in Istanbul. The government blames radical Marxist group the DHKP-C.