Saudi Arabian prosecutors is seeking the death penalty for five of the 11 suspects detained over the murder of journalist Jamal Khashoggi, the state news agency SPA said on Thursday, as a Saudi court held a first hearing on the case.

Saudi Arabia said it also sent new letters to the Turkish public prosecutor asking for "any evidence connected to this case," which has rattled the Saudi royal court and damaged the reputation of 33-year-old Crown Prince Mohammed bin Salman.

Khashoggi was close to the royal circles before becoming a critic of Prince Mohammed, writing for the Washington Post and speaking to international media about Saudi politics when he moved to the United States last year.