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Guerrero state Health Secretary Lazaro Mazon Alonso said the party was held Friday at a school in Organos village and people began showing up at hospitals the next day for treatment of food poisoning.

He said those fallen ill included 220 children as well as nine adults, among them teachers, parents and school staff.

Mr. Mazon Alonso said Sunday that the state health department is analyzing food served at the party to determine exactly what caused the food poisoning.

PERU

Peru to investigate mass deaths of pelicans

LIMA — Peru’s oceanographic agency said it will investigate the deaths of hundreds of pelicans on northern beaches where nearly 900 dolphins were recently found dead.

Puerto Eten fisherman’s association President Fernando Niquen said his group found about 1,200 dead pelicans Thursday and Friday along a 105-mile stretch of coastline.

The government’s Institute of the Sea said it found nearly 600 dead birds, mostly pelicans but also gannets, along a 43-mile stretch.

Its regional chief, Edward Barriga, recalled a mass die-off of pelicans and cormorants in the same area in 1997 from the absence of anchovies blamed on the El Nino meteorological phenomenon.

Coast Guard official Cesar Villanueva in Lambayeque said Sunday he has never seen so many dying pelicans on the beach in 25 years on the job.

From wire dispatches and staff reports