It's spot the missing word time

The BBC report that:

'At least 10 people have been killed in attacks on churches in the Kenyan town of Garissa near Somalia, police say. "So far we have at least 10 killed, and more than 40 wounded," regional deputy police chief Philip Ndolo told Reuters.'

Read the whole article and see if you can spot who the culprits might be? There is a clue in the article:

'Kenya's border region has been tense since it sent troops into Somalia to pursue al-Shabab Islamic militants. Kenya said the operations, launched last October, were designed to bring an end to kidnappings on Kenyan soil and other violence which it blamed on al-Shabab.'

So might the culprits be Islamist terrorists operating under the al-Shabab banner? That's a question that the BBC will do their utmost to not ask.