Timelines: Recent Al Shabaab attacks

January 27: Nine Kenyan soldiers killed in an intense battle after Al Shabaab militants strike their Kolbiyow camp in Somalia

February 2: Gunmen believed to be Al Shabaab terrorists attack a police post and destroy communication masts in Arabia, Mandera County

March 2: Kenya Defence Forces (KDF) soldiers kill 57 gunmen said to be Al Shabaab militants in a clash in Afmadow, Somalia

March 27: Two Kenyans, Ahmed Yusuf Hassan and Ahmed Nur Abdi Osoble, executed by Al Shabaab's firing squad in Buq Aqable in Hiraan as hundreds of local residents watch. The two were accused of collaborating with the Somali government and allied force operatives

May 15: Gunmen believed to be Al Shabaab militants attack a village near Mandera town and kill a chief before abducting two Kenya Police Reservists

May 16: Four people killed when a vehicle they are travelling in runs over an improvised explosive device (IED) planted by Al Shabaab in Liboi, Garissa County

May 24: Five police officers killed when a vehicle they are travelling in is hit by an IED in Simo, Arabia, Mandera County. The officers were part of Governor Ali Roba's security team and were escorting him to a campaign rally in Lafey

May 24: Three police officers killed and two others injured when their vehicle runs over an IED in Kulan, Liboi, Garissa County

May 25: Two police officers killed and four others injured when an IED tears through their vehicle along the Malelei-Kulan road in Liboi, Garissa County

May 31: Four AP officers killed, several injured when their armoured personnel carrier hits an IED in Baure, Lamu County

Al Shabaab militants attack and destroy a Safaricom mast in Fafi, Garissa County

June 10: Two Kenyans executed in public by Al Shabaab terrorists in Bula Fulay village along the Bay region of Somalia for allegedly working for anti-terrorism spies from Kenya

June 16: Four people killed, 11 injured in Mandera County when a passenger service vehicle they are in runs over an IED in Sheikh Barrow on the Lafey-Elwak road, Mandera County

June 23: Five people killed by Al Shabaab in Elwak, Mandera

July 5: Suspected Al Shabaab gunmen raid Pandanguo in Lamu County

July 7: Nine people beheaded in Lamu by suspected Al Shabaab militia