BELGRADE, Dhu-AlHijjah 12, 1437, Sep 13, 2016, SPA -- Serbian and German police arrested 30 people in a suspected drug smuggling ring and seized narcotics worth around 20 million euros ($22 million) on Tuesday, Reuters cited Serbia's interior minister, as saying. Police seized 303 kg (670 lb) of cocaine, 106 kg of hashish and 96 kg of marijuana as well as weapons and money, after investigations lasting 13 months. Suspects were arrested in Croatia, Germany and Serbia on Tuesday, with 21 others arrested in Spain, Belgium and Hungary between October 2015 and March 2016, Germany's federal police said in a statement. Three further suspects remain at large. German police said the drug smuggling ring was suspected of selling drugs across Europe from bases in Belgrade and Essen, Germany, and maintaining illegal "indoor plantations" of marijuana at numerous sites in both countries. Serbia, which lies on key drug-smuggling routes between Central Asia and the wealthy markets of Europe, has stepped up efforts to combat organised crime and corruption to fulfil conditions for joining the European Union. -- SPA 22:33 LOCAL TIME 19:33 GMT www.spa.gov.sa/w