In Sunday's attack, fighters are said to have fired a grenade on a police vehicle at a highway crossroads as officers were changing shifts, Liberte reported.

 

A second police vehicle came under machine-gun fire, Liberte reported, citing witness accounts.

 

Security forces dispatched reinforcements, prompting a two-hour fire fight.

 

It was not immediately clear whether any of the assailants were detained or injured.

 

There was no independent verification of the attack.