The call crackled over the California Highway Patrol scanner as darkness enveloped Interstate 5 in the San Fernando Valley.
Saudi Arabia rejects political and economic threats over missing journalist Jamal Khashoggi, a source quoted by state news agency SPA says.
The country would respond to any punitive action with a bigger one, the unnamed senior source said.
Mr Khashoggi, a critic of the Saudi government, vanished on 2 October after visiting its consulate in Istanbul.
US President Donald Trump said he would punish Saudi Arabia if it were found responsible for killing him.
The authorities in Istanbul believe Mr Khashoggi was murdered in the consulate by Saudi agents claims Riyadh has dismissed as lies.
- What we know about Saudi journalists disappearance
- The journalist who vanished into a consulate
- Why Khashoggi case alarms Saudi activists
Britain and the US are considering boycotting a major international conference in Saudi Arabia this month.
What is the latest from the Saudis?
The source quoted by SPA said: The kingdom affirms its total rejection of any threats or attempts to undermine it whether through threats to impose economic sanctions or the use of political pressure.
The kingdom also affirms that it will respond to any action with a bigger one. The Saudi economy has vital and influential roles for the global economy.
The Saudis have come under considerable international pressure over the disappearance.
Diplomatic sources told the BBCs James Landale that both US Treasury Secretary Steve Mnuchin and UK International Trade Secretary Liam Fox might not attend next months investment conference in Riyadh, which has been dubbed Davos in the Desert.
However, later White House aide Larry Kudlow told ABC News that as things stoo...