An odd story from Tanzania, which starts with:
Tanzanian police broke up an al-Shabaab training operation in Tanga region, arresting 69 suspects and freeing dozens of recruits ranging from 4 to 13 years old in a security sweep carried out October 28th to November 5th.....The presence of al-Shabaab in the district came to light in the last week of October (2013), when aggrieved citizens notified local government officials about the training camp located in the Lwande forest. ....four al-Shabaab trainers had arrived in Kilindi district in 2008...
Link:http://sabahionline.com/en_GB/articl.../15/feature-01

A lack of official awareness is one thing, it happens. What is important is that mainland Tanzania is not know for radical Islam, let alone sympathy for the violent Joihad (Zanzibar is somewhat different). I exclude the 1998 US Embassy bombing, which IIRC was an externally sourced attack.

Tanzania has a difficult demographic:
According to recent estimates 37% of the population is Muslim, 38.1% Christian, 19.6% practices Animism, while 5.4% of the population is unaffiliated or follows other religions.[64][65] Of Muslims, 16% are Ahmadiyya, 20% are non-denominational Muslims, 40% are Sunni, 20% are Shia and 4% are Sufi.

Zanzibar is about 97 percent Muslim. On the mainland, Muslim communities are concentrated in coastal areas, with some large Muslim majorities also in inland urban areas especially and along the former caravan routes.
Link:http://en.wikipedia.org/wiki/Tanzania and the wider situation:http://www.bbc.co.uk/news/world-africa-14095868