Madonna axes Argentina show

Madonna has postponed the first of four shows in Argentina - just one week after kicking off the Latin American leg of her world tour.

The singer was scheduled to perform in the country's capital, Buenos Aires on Wednesday for her Sticky & Sweet tour, but pulled the plug on the opening concert at the request of River Plate Stadium's production team, Time 4 Fun.

Reports from local news media suggest sound equipment hasn't arrived due to flight delays, and predict the concert will be rescheduled for Monday.

The star's scheduled performances on Thursday, Saturday and Sunday have not been affected.

Madonna launched the Latin American leg of her tour last week in Mexico City and is due to perform in Chile and Brazil following the Argentina dates.

But the setback has not slowed her down - the singer was hosted by Argentine President Cristina Kirchner on Tuesday, where she met with former presidential candidate and Colombian hostage, Ingrid Betancourt.

The South American tour is intended to highlight the plight of hostages still in the hands of the Revolutionary Armed Forces of Colombia (FARC) - the group that held Betancourt in captivity for six years.