The Spanish press is reporting that Dani Amatriain, former manager of MotoGP star Jorge Lorenzo - as well as 125/250GP riders Pol and Alex Espargaro - has been arrested.

Sportspaper Marca states that Amatriain was arrested in Barcelona, venue for this weekend's Grand Prix of Catalunya, after making death threats against his former riders.

Amatriain, who guided Lorenzo to two 250cc world titles (pictured) before his 2008 MotoGP debut, is alleged to have demanded money from the riders during early morning phone calls and face to face meetings.

Lorenzo split from Amatriain late last year and has attempted to make a 'fresh start' in 2009, even dropping his traditional #48 for the number 99.

The Spaniard has won two of the five races so far this season and is currently second in the world championship, just four points behind Ducati's Casey Stoner and five points ahead of Fiat Yamaha team-mate and reigning champion Valentino Rossi.

Whilst racing in the lower classes, Amatriain and Lorenzo frequently clashed with the other Spanish power-pairing of Dani Pedrosa and Alberto Puig.