And in the commercial capital Jeddah, security forces dispersed a large protest by illegal migrants and arrested five Ethiopians suspected of organising the demonstration, a police spokesman said.
Protests are banned in the ultra-conservative kingdom, where tensions have been spiralling since the authorities began rounding up thousands of illegals following the expiry on November 4 a final amnesty for them to formalise their status, an AFP correspondent said.
Among them are foreigners who overstayed their visas, pilgrims who have sought jobs, and migrants working under one sponsor trying to get jobs elsewhere.
Riyadh had already announced the deaths of a Saudi and two foreigners in Manfuhah on Saturday, while the Ethiopian embassy said three of its nationals had died in clashes.
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Police vehicles on Thursday jammed the main street of Manfuhah, which is populated mainly by Africans, the AFP correspondent said.
For the fifth day in a row, long lines of illegal migrants queued in Manfuhah for buses to take them to repatriation centres.
The heavy security force presence brought commercial activity in the neighbourhood to a near-halt, with many shops and restaurants catering to Indians, Pakistanis and Ethiopians remaining shut.
He said he had entered the kingdom illegally after travelling by boat from Yemen.
Another Ethiopian, Ahmad Mumen, arrived three years ago, also clandestinely.
"I have no papers," said the youth, adding that he had found night-time employment in a shop.
Most of the women queueing for the buses said they had found employment as domestic workers.
Many illegal migrants living in the area have turned themselves in to police to be deported.