A partygoer is in a coma and eight others hospitalised after a swimming pool was filled with liquid nitrogen at Jagermeister event in Mexico. Source LiveLeak

A YOUNG man remains in a coma after organisers of a party designed to promote Jagermeister pumped liquid nitrogen into a swimming pool.

Nine partygoers who were in the pool at the time were taken to hospital after four buckets of liquid nitrogen were poured in. Eight of the nine have since been released.

Last Saturday's party, held in Leon, Mexico, was attended by about 200 people, mainly young adults.

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Witnesses told the Daily Mail party organisers, dressed in orange uniforms, had added the substance to the pool to create a smoke effect.

But shortly thereafter, party attendees noticed people in the pool passing out and losing consciousness.

It has been suggested that the liquid nitrogen had a chemical interaction with the chlorine in the pool which created toxic smoke.

A 21-year-old man, identified as Jose Ignacio Lopez del Toro by Univision Noticias, remains in a coma in Campestre Medical Hospital.

Mexican officials have launched an investigation.

In a statement from Jagermesiter headquarters in Germany, company officials said they were working with event organisers and authorities to determine what happened.

"We fully support responsible drinking and adhere to the guidelines within each market in which we operate," the Jagermeister officials said in their statement.