ISTANBUL, Turkey - The Islamic State group could inadvertently benefit from a situation in which Syrian government forces are considerably weakened on the ground, a London-based military analysis group said on Tuesday.

The report, published by IHS Jane's Terrorism and Insurgency Centre, follows the United States bombing of a Syrian army base after an alleged chemical weapons attack on April 4 killed nearly 90 people.

The US has accused the Syrian government of being behind the attack charges that Syria denies.