TEHRAN [Iran], Iran began funeral ceremonies on Tuesday for its late President Ebrahim Raisi, who was killed in a helicopter crash, as authorities began investigating the cause of the crash, state-owned network Press reported. A huge crowd can be seen in the funeral procession in TV footage. The site of the helicopter crash of President Raisi and his entourage, in the north-western city of Tabriz Raisi's funeral will take place on May 23 in the Iranian city of Mashhad in the north-east of the country, the Vice President of the Republic, Mohsen Mansouri, announced that the funeral will take place on Thursday evening. Will be performed at the tomb of Imam Raza. The tomb of Imam Reza is located in Mashhad, Raisi's hometown, a center of pilgrimage and one of the main pilgrimage sites for Shias. The bodies of the deceased will be transferred from the holy shrine of Hazrat Masoumeh to the holy city of Qom. SA) to the Jamkaran Mosque, before then flying to the capital, Tehran. Large ceremonies are planned at Tehran's Grand Mosallah Mosque on Wednesday. Raisi's body will then be taken to the historic Imam Reza shrine in Masha, where Iran's supreme leader Ayatollah Khamenei will offer prayers.The Mehr news agency announced five days of mourning on Monday and a public holiday with offices closed across the country. Iran will elect its new president to replace Raisi on June 28, state media reported. It has been decided to do so. Raisi's successor was selected during a meeting of the heads of the judiciary, government and parliament. The registration of candidates will be conducted from May 30 to June 3 and the election campaign period will be from June 12 to 27. Also, an investigation has begun into the helicopter crash that killed Raisi and his accompanying team, news agency IRN said on Tuesday, adding that the Chief of Staff of the Iranian Armed Forces, Major General Mohammad Bagheri, has ordered an investigation into the matter. Assigned to a high-ranking delegation. State media reported that a delegation led by Brigadier Ali Abdullahi had been sent to the site of the incident and an investigation had begun.The results of the investigation will be announced later upon completion of the mission, IRN reported In accordance with Iran's constitution, Supreme Leader Ayatollah Khamenei nominated Iran's First Vice President Mohammad Mokhbar as the country's acting president, Article 131 of the Iranian Constitution. The 63-year-old Raisi, his Foreign Minister Hossein Amirabdollahian and seven others died when the helicopter they were in crashed, according to a council formed to manage the country's executive affairs for a period of 50 days and prepare for presidential elections. He crashed in a remote area. o Presidential elections were held on May 19 in northwestern Iran, scheduled to be held in 2025, Vice President Mohammad Mokhbar has been appointed to take over interim duties, Iran's cabinet also appointed Deputy Foreign Minister Ali Bagheri Kani as acting foreign minister .