Turkish President Recep Tayyip Erdogan says some materials in the Saudi Consulate in Istanbul were painted over. The statement comes after investigators into journalist Jamal Khashoggi's disappearance searched the building.

Some substances Turkish police were looking for at the Saudi consulate in Istanbul seem to have vanished, Erdogan told reporters on Tuesday. He claimed that “the investigation is looking into many things such as toxic materials and those materials being removed by painting them over.”

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Erdogan did not expand on that claim, only adding that “my hope is that we can reach conclusions that will give us a reasonable opinion as soon as possible.”

Previously, a Turkish forensic team spent nine hours looking for clues and DNA samples which could shed light on the mysterious vanishing of Khashoggi, who Ankara believes was assassinated at the diplomatic mission.

Meanwhile, a Turkish diplomatic source told Reuters the investigators are considering extending the search to the residence of the Saudi consul. Local TV channels have broadcast what they said was footage of a vehicle exiting the consulate premises and parking at the residence two hours after Khashoggi disappeared.

Speculation that the Saudis might have destroyed crucial evidence at the site were fueled by footage showing two women and a man bringing cleaning gear through the front door of the consulate. Coincidence or not, the “cleaners” entered the building on the day a joint team of Turkish and Saudi experts were to search the mission.

Ankara has accused Riyadh of murdering Khashoggi and smuggling his body out of the consulate in pieces. Saudi Arabia has denied the charges as “baseless.”

According to CNN, there is a yet-to-be-published Saudi report that will blame Khashoggi’s death on an attempted abduction and botched questioning, “carried out without clearance and transparency.” The unconfirmed report is based on two anonymous sources that reportedly spoke to CNN’s correspondents.

READ MORE: Saudi diplomatic immunity must be waived over Khashoggi case - UN rights chief

This comes as US Secretary of State Mike Pompeo visits Riyadh. He was urgently sent by President Donald Trump to meet with the Saudi monarch. Trump has threatened the kingdom with “severe punishment” if it is found to be involved in Khashoggi’s disappearance, but he later changed tune and said Saudi King Salman “denies any knowledge of whatever may have happened” to the journalist.

“It sounded to me like maybe these could have been rogue killers. Who knows?” Trump said.

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