town gained municipality status. In the 1970s, the area changed radically when the federal government decided to develop the Zihuatanejo-Ixtapa area into a tourist attraction. This caused the population to increase dramatically, especially in the 1980s and today the main economic base is tourism.
Tourism in Zihuatanejo was negatively impacted by some events in the 2000s. In May 2008, bull sharks gathered in large numbers along the coast for unknown reasons; two surfers were killed and a third was injured. The attacks occurred during a three-week period causing a "Jaws-like mania" and the construction of lifeguard towers and the establishment of a shark patrol for the beaches of Zihuatanejo and north. It was a rare phenomenon that subsided after the sharks dispersed.
On 20 February 2009, a group of men in a pickup truck threw explosive devices at the installations of the Secretariat of Public Safety of the municipality of Zihuatanejo, resulting in five persons injured. The attack occurred at 7:45 pm near the municipal docks. At the time of the attack, the 56th Infantry Battalion had been stationed in Zihuatanejo, mostly to interdict the traffic in arms, drugs and stolen vehicles. The grenade attack on the security headquarters was followed by a highway ambush that killed four policemen. Kidnapping of Mexican citizens has been a problem here as well. In one instance four kidnapping victims were rescued by elements of the Mexican military and police, killing one suspect in the process
