Yemen on Tuesday handed over to Saudi Arabia two Saudi nationals wanted by Riyadh over drug trafficking charges, security sources said. The sources told Deutsche Presse-Agentur dpa the two men have been arrested in Yemen on a Saudi warrant sent to Yemeni security authorities under a security cooperation pact. Saudi fugitives often flee to Yemen through its porous borders with the oil-rich kingdom. Last April, Saudi Arabia and Yemen exchanged 27 prisoners wanted in each other's countries for various criminal and terrorist charges. During 2005, Yemen extradited 69 men to Saudi Arabia wanted by Riyadh for suspected connections with terrorist attacks in the kingdom. Sana'a and Riyadh have in recent years closely cooperated to curb the movement of suspected terrorists or drug traffickers through their vast joint desert borders. Since 2002, Yemen and Saudi Arabia have swapped dozens of suspects, including men accused of links to terror bombings in both countries.