Egyptian protesters on Wednesday set fire to a military intelligence building on the Libyan border, a day after deadly clashes with security forces, security officials told AFP.
Residents of the border town of Sallum also blocked the motorway to Libya, allowing access only to Libyan families returning home, the official said.
They later withdrew their blockade of the motorway, state news agency MENA said.
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The unrest comes after residents blocked the road on Tuesday night to protest security restrictions on cross-border traffic and increased tariffs for lorries.
Security forces intervened, leading to clashes that left two people dead and four injured.
Egypt has been gripped by security-related problems, protests and clashes since a popular uprising that toppled president Hosni Mubarak last year.