FIFA president Sepp Blatter says the South African stadium stampede that left a policeman seriously injured is "like an alarm clock" sounding to warn World Cup organisers.

Blatter said FIFA regretted Sunday's incident that left 15 people injured outside Makhulong Stadium in the township of Tembisa near Johannesburg, adding "this is like an alarm clock and this will not happen at any match at the World Cup".

The stampede occurred at a friendly between Nigeria and North Korea.

FIFA secretary general Jerome Valcke said on Monday that "we have to make sure that the police working around the World Cup stadiums will do better than what we have seen yesterday".

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