Durban police cannot act on an invitation to attend the next alcohol-and drug-fuelled Project X party.

Police spokesman Colonel Vincent Mdunge said the police could not check on every party that teenagers attended.

The invitation sent out on social networks and on BlackBerry messenger clearly calls for teenagers to drink alcohol and take drugs at the party, planned for Saturday in Assagay, outside Durban.

This will be the third Durban party based on the film Project X, in which three American teenagers invite people to their party but end up with more than they bargained for.

"The police will do as much as they can if a crime is committed at these parties but it is up to parents to keep their children away from these parties and up to teenagers to stay away. It is just impossible for us to stop every teenage party," Mdunge said.

The Facebook page Waterfall Crime Watch has been flooded by messages from concerned parents after the last Project X party. Waterfall is a suburb of Pinetown, near Durban

"In the current invitation the host blatantly tells teenagers there will be drugs and alcohol there," its author, Steven King, said. "But one can never say if this invitation is just a hoax."

King said the Project X party in Pinetown two weeks ago was a "flop" because parents were aware of it and kept their children away.

After the party in Hillcrest, west of Durban, three weeks ago two girls were admitted to hospital and the house was trashed .