In north-east Nigeria, a region where Boko Haram militants have wreaked havoc, poverty and lack of job opportunities are often cited as contributing to young people's susceptibility to extremism.
" China has long been concerned that Muslim militants in its western Xinjiang region may be getting training and support from fighters in Pakistan's lawless tribal areas.
The attacks came as Iraqi security forces and Sunni tribesmen are fighting al-Qaida militants in the cities of Anbar province in western the country.
