Berlin:Senior German politicians on Sunday called for stricter controls on the sale of guns in response to the Munich shopping centre shooting that left nine people dead. Vice-Chancellor Sigmar Gabriel said everything possible should be done to limit access to deadly weapons, BBC reported. "We must continue to do all we can to limit and strictly control access to deadly weapons," Gabriel, who leads the centre-left Social Democrats, the junior party in the governing coalition, told the Funke Mediengruppe news group. Ali David Sonboly, 18, on Friday evening shot dead nine people before killing himself. He had a Glock pistol and more than 300 bullets. Gabriel said the authorities were investigating how Sonboly, the German-Iranian dual national, had gained access to a weapon despite signs of significant psychological problems, BBC said. "Gun control is an important issue," he said. Interior Minister Thomas de Maiziere, who visited the scene of the shootings, said he planned to review gun laws. Vigils are continuing in Munich to commemorate the victims, seven of whom were teenagers. Three were from Kosovo, three from Turkey and one from Greece. No motive has yet been established for the attack but police have ruled out any connection to recent Islamist militant attacks in Germany and France.