15 June 2011 Last updated at 12:36 GMT
Seismologists say the volcano could continue spewing ash for some time
Flights to East Africa have been severely disrupted as ash from an Eritrean volcano spreads across the region and heads towards Saudi Arabia.
Several airlines said they had stopped flying to Eritrea, Sudan, Djibouti and Ethiopia.
The ash cloud was now changing direction, from north-west to south-west and had reached Sudan and Egypt, an Ethiopian academic said.
The cloud followed a volcanic eruption in Eritrea at the weekend.
It forced US Secretary of State Hilary Clinton to cut short a three-nation tour of Africa on Monday.
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