A security guard passes a document to a colleague outside Saudi Arabia's Consulate in Istanbul on Oct. 15, 2018, nearly two weeks after Saudi journalist Jamal Khashoggi was killed at the consulate. Credit: Petros Giannakouris | AP

ISTANBUL — A Turkish court issued arrest warrants Wednesday for two close aides to Mohammed bin Salman, Saudi Arabia’s crown prince, after prosecutors accused the aides of helping plan the murder of journalist Jamal Khashoggi, Turkey’s state-run news agency said.

The aides, Maj. Gen. Ahmed al-Assiri and Saud al-Qahtani, are believed to be in Saudi Arabia, and there is little chance the Saudi government will surrender the men to Turkish authorities. Rather, the warrants appeared to be part of a continuing effort by the government of President Recep Tayyip Erdogan to pressure Saudi Arabia into revealing more details about Khashoggi’s killing, as well as to isolate the crown prince.

The warrants were issued a day after several U.S. senators accused the crown prince of complicity in the murder, using some of their harshest language to date. They made the accusations after CIA Director Gina Haspel briefed the senators in an unusual closed-door session on evidence that the agency has collected in the Khashoggi case.

“If the crown prince went in front of a jury, he would be convicted in 30 minutes,” Sen. Bob Corker, R-Tennessee, chairman of the Senate Foreign Relations Committee, said after the briefing.

Senior Trump administration officials have insisted that no “smoking gun” evidence shows Mohammed’s direct involvement. Saudi Arabia says that while its investigation into the killing is still underway, it has already absolved the crown prince.

Khashoggi, a contributor to The Washington Post and a sometime critic of Mohammed, was killed by a team of Saudi agents soon after entering the Saudi Consulate in Istanbul on Oct. 2. His body was dismembered after the murder, according to Turkish and Saudi prosecutors. His remains have not been found.

On Wednesday, the United Nations human rights chief, Michele Bachelet, called for an international investigation into the killing. “I do believe it is really needed in terms of ensuring what really happened and who are the [people] responsible for that awful killing,” Bachelet said at a news conference in Geneva, according to the Reuters news agency.

Turkey has also raised the possibility of an international investigation while aggressively pursuing its own probe. Prosecutors requested warrants for Assiri and Qahtani on Tuesday based on a “strong suspicion” that they were “among the planners” of Khashoggi’s murder, according to excerpts of the prosecution’s application that were provided by a Turkish official.

The prosecutors’ language placed responsibility for the murder in the crown prince’s inner circle and left open the possibility that other senior Saudi officials were involved in its planning.

Assiri, an air force officer, served as spokesman for the Saudi-led military coalition fighting in Yemen before he was appointed deputy chief of Saudi intelligence in 2017 — a promotion that was said to reflect his close ties to the crown prince.

Qahtani, a friend and close adviser to Crown Prince Mohammed, was regarded as the royal court’s chief enforcer, promoting the kingdom’s aggressive policies on social media and personally supervising a crackdown on government opponents and dissidents. They included Khashoggi, who received several calls from Qahtani trying to persuade the journalist to end his exile in the United States and return to Saudi Arabia, Khashoggi’s friends said.

A few weeks after Khashoggi’s death, Saudi Arabia announced that both Assiri and Qahtani had been fired from their posts. Saudi prosecutors have linked both men to a plot to bring Khashoggi back to Saudi Arabia alive but blamed the murder itself on lower-level operatives who purportedly acted outside their authority.