Officials say the number of people crossing the Libyan border has suddenly dropped because it is now being manned by heavily armed forces loyal to Libyan strongman Moammar Gadhafi.
Red Cross officials also said Friday that two Libyan Red Crescent ambulances were shot at in Misrata, west of Benghazi, and two volunteers were injured.
They say one ambulance was completely burned.
U.N. refugee agency spokeswoman Melissa Fleming says less than 2,000 people made it across the border into Tunisia over the last day, compared with 10,000 to 15,000 previously.
She says many of those who cross are too terrified to speak and had mobile phones and cameras confiscated.
She says other foreign workers are staying put because "they feel hunted and targeted."
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