A grenade thrown into a cafe hurt four people on Wednesday in the northern city of Tripoli, security officials said.

The motive for the attack was not immediately clear, but there were suspicions the cafe was targeted for opening its doors during the Muslim fasting month of Ramadan.

"Four people, including two Syrian nationals, were injured when unknown assailants threw a grenade into a cafe in the Bab al-Tabbaneh district" in Tripoli, a security official told Agence France Presse.

The assailants approached the cafe on a motorbike and tossed the device in before escaping.

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