A Reuters report on Tanzanian action, based on official statement(s) and includes this, possibly new information:
Earlier this month, Mozambique put 189 people, including foreigners, on trial on accusations of involvement in Islamist attacks in Cabo Delgado.
Link:https://uk.reuters.com/article/uk-ta...-idUKKCN1MU0N1

Interesting to note Tanzania has a large natural gas field offshore that awaits investment.