[Al-Shabaab training. The group is said to have attacked again on Tuesday, killing four people in Garissa.] (cbs-news)

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Four people were on Tuesday killed after the vehicle they were travelling in ran over an Improvised Explosive Device in Garissa County.

According to security sources who spoke to a local daily, the four died on the spot when the vehicle belonging ADESO, a non-governmental organisation working in Somalia, ran over the IED.

The workers are said to have been going to their offices in Dobley when the incident occured.

The incident comes barely two weeks after three Administration Police were killed in between Kulan and Dadaab in an IED attack.