Islamic rebels are being blamed for a bomb attack in the Russian republic of Ingushetia that has left at least 18 people dead. The target was a local police headquarters in the city of Nazran.The mainly Muslim region has seen an upsurge in violence in recent months, including a bomb attack that severely injured the Kremlin-backed president. Some 50 people were injured in the latest blast that caused extensive damage over a wider area. The bomb is reported to have been in a truck parked near the base, and that it exploded as officers lined up for morning inspection. Critics of the regional government say the unrest is fuelled by corruption and abuse of power by authorities.