On 2 April, 2012, Mayor Jeffrey Lim of Salug, Zamboanga del Norte was kidnapped by ten armed men disguised as policemen. Lim was reportedly handed over to Abu Sayyaf. On 6 November, he was freed near Zamboanga City after payment of P1.3M  ransom. On 9 August, 2013, a Mindanao Pagadian Frontline report named a "Sehar Muloc" aka "Red Eye" as a suspect in the 2012 kidnapping of Mayor Jeffrey Lim. Abner Gumandol, alias Sehar Muloc and Red Eye, was said to be the leader of a criminal syndicate called the Muloc Group. Gumandol was arrested on 12 June 2016.
Question: How many years after the kidnapping was Gumandol arrested?
Answer: 4