( CNN ) -- Funeral services were held Sunday for Saudi Crown Prince Nayef bin Abdulaziz , a hard-line conservative credited with pushing back al Qaeda . Nayef , named crown prince in October by his brother the king , was heir to the Saudi throne . Saudi state TV , which reported his death Saturday , broadcast Quran readings as an expression of mourning for the prince , who died in Geneva , Switzerland . He was in his late 70s . `` It is a shock . We all knew his health was frail , but his death is a shock , '' Saudi Foreign Ministry spokesman Osama Nogali said . `` We still do n't know the reason behind his death . '' The Saudi Press Agency published a statement from the Royal Court , saying it `` condoles the Saudi people on the deceased prince pray to God to bless his soul and to reward him for his services to his religion and homeland . '' Nayef 's body arrived at the Grand Mosque in Mecca on Sunday . He was to be buried following the funeral in Al-Adel cemetery in Mecca , according to Oussama Nogali , Saudi foreign ministry spokesman . Saudi King Abdullah was in attendance at the funeral , along with Gen. Hussein Tantawi , head of Egypt 's Supreme Council of the Armed Forces . After the funeral , a period of mourning -- most likely for three days -- will be announced , a Saudi official said . The official asked not to be named because he is not authorized to speak to the media . U.S. President Barack Obama released a statement Saturday offering his condolences . `` Under his leadership , the United States and Saudi Arabia developed a strong and effective partnership in the fight against terrorism , one that has saved countless American and Saudi lives , '' Obama said . He praised Nayef for supporting a broad partnership between Saudi Arabia and the United States . U.S. Vice President Joe Biden similarly offered his condolences , and hailed the former leader as an important ally in the fight against terror . It is expected that authorities selected by the king to choose a successor will meet as soon as the mourning period is over , the official said . A new crown prince could be named within the next three to four days , the source said . Nayef served as Saudi interior minister since 1975 , overseeing the kingdom 's counterterrorism efforts . He also served as deputy premier . A classified U.S. Embassy cable leaked by the website WikiLeaks described Nayef as a hard-line conservative who was lukewarm to King Abdullah 's reform initiatives . Nayef led the crackdown against hard-line Islamists who took control of Mecca in 1979 and also oversaw the smashing of Saudi-based al Qaeda cells in the mid-2000s . In recent years , his son , Prince Mohammed bin Nayef , has led the kingdom 's fight against al Qaeda as the elder Nayef seemed to have taken more of backseat . On Saturday , the Bahrain state-run news agency announced three days of mourning in that country and ordered flags to be lowered to half-staff there and at its embassies abroad . Kuwait also announced a three-day mourning period . CNN 's Rima Maktabi , Hamdi Alkhshali , Mohammed Jamjoom and Kevin Flower contributed to this report .
NEW : This means the product will ship as received by the manufacturer, sealed, with all advertised components, and with the manufacturer warranty. Nayef was heir to the Saudi throne . He had served as interior minister since 1975 .