On 2 April 2015, 3 Iranian officers were killed by unidentified gunmen in the city of Hamidiyeh, about 25 kilometers  west of the city of Ahvaz. Additional 2 casualties were sustained by the Iranian security on 26 October 2015. In early June 2016, a Sunni group known as Suqour al-Ahvaz  blew up the Bou-Ali-Sina Petrochemical Complex in Bandar-E Mahshahr, Khuzestan. On July 2016, on two occasions Ahwazi militants of al-Farouq Brigade of the Ahwazi National Resistance blew up pipelines in the Johar as-Sabaa' district. Reportedly, members of the al-Farouq Brigade managed to escape after the operation, despite efforts of the security forces and Revolutionary Guards to track down the offenders. According to Algemeiner, the group responsible for the 11 and 17 July attacks was Suqour al-Ahvaz . In August 2016, Iran executed 3 men, charged with terror attack which led to the death of 3 Iranian policemen in Khuzestan province back in April 2015. On October 2016, a young girl was killed, when Iranian security forces attempted to arrest her father, wanted for security reasons.
Question: How many months do these events span?
Answer: 18