French anti-terrorism forces have arrested four people, including a 16-year-old girl, and uncovered a makeshift laboratory with the explosive TATP, the Paris prosecutor's office said.

Spanish seventh seed Marcel Granollers was knocked out of the Sud de France Open in Montpellier by French veteran Jeremy Chardy on Monday.

They were 54-point winners over their French visitors.

Montpellier beat Castres 32-14 in the Champions Cup despite playing more than an hour with 14 men.

Leo Cullen has packed all his heavy artillery as Leinster fly to the south of France for their toughest game of the season.

Stephen Myler landed an injury-time penalty to give Northampton a winning start to their Champions Cup campaign in a 16-14 victory over Montpellier at Franklin's Gardens.

It was O'Shea's last game in charge before he takes over as Italy's new head coach this summer.