Question: Whose authority were the Mexican police under that had a shootout with the CJNG in 2015?

<P0-S0> On May 22, 2015, a three-hour shootout broke out between the Mexican Federal Police and alleged members of the Jalisco New Generation Cartel (CJNG) in Tanhuato and Ecuandureo, Michoacán, leaving 43 dead. <P0-S1>  One of the fatalities was a Federal Police officer, while the others were suspected to be organized crime members. <P0-S2>  The confrontation started when the Federal Police spotted a suspicious vehicle on a highway. <P0-S3>  The authorities had received information that one of the properties in the area had been overrun by criminals. <P0-S4>  Unconfirmed reports suggested that the CJNG leader Nemesio Oseguera Cervantes was in the area. <P0-S5>  When they tried to pull over the vehicle, however, the men onboard opened fire at the police units. <P0-S6>  A vehicle chase ensued and the security forces made their way into a large, rural property where the shootout intensified. <P0-S7>  The Federal Police then called for ground and air reinforcements and neutralized the situation. <SEP> <P1-S0> On 1 July 2010, members of two rival cartels clashed near the village of Sáric, in Mexico's northwestern state of Sonora, approximately 12 miles southeast of the little-used port of entry in Sasabe, Arizona. <P1-S1>  Local news media and officials in the Mexican government reported that the violence was the result of an ambush, organized by a group aligned with the Beltrán-Leyva Cartel to stop a convoy of over 50 vehicles of the Sinaloa Cartel from entering Saric. <P1-S2>  The Beltrán-Leyva group took up positions on a hill along the road outside of Saric, and as the convoy approached, laid down a devastating barrage of fire into the convoy below. <P1-S3>  Shortly after the fighting ended, Mexican police and military arrived to find the bodies of 21 dead and several bullet-strewn vehicles, mostly SUVs. Nine men were taken into police custody, six of whom received wounds in the shootout. <SEP> <P2-S0> The Federal Police (Spanish: "Policía Federal, PF" ), formerly known as the "Policía Federal Preventiva" (Federal Preventive Police), is a Mexican police force under the authority of the Secretariat of the Interior. <P2-S1>  They are sometimes referred to by the slang term "Federales". <P2-S2>  Typically, agents of the Federal Police are heavily armed and wear dark blue, black, or gray combat fatigues. <SEP> <P3-S0> On April 6, 2015, a convoy of the Jalisco State Police was ambushed by suspected members of the Jalisco New Generation Cartel (CJNG), a criminal group based in Jalisco. <P3-S1>  The attack occurred in a mountain road in San Sebastián del Oeste, Jalisco. <P3-S2>  Fifteen policemen were killed and five were wounded; no CJNG casualties were confirmed. <P3-S3>  According to police reports, as the police convoy reached a part of the road surrounded by mountains, the CJNG opened fire at the police units from the sides using high-caliber rifles, grenade launchers, and explosives with gasoline. <P3-S4>  The element of surprise prevented the police from repelling the aggression. <P3-S5>  The CJNG members burned several vehicles along the highway to halt reinforcements. <P3-S6>  The attack lasted roughly 30 minutes. <P3-S7>  When government reinforcements reached the scene, the CJNG gunmen had left.