This comes a day after Garowe has rejected a six-member negotiation committee appointment by Farmajo.
The landmine blast comes a day after 17 people killed in a suicide car bomb blast in Mogadishu.
He beat Jeremy Hunt comfortably, winning 92,153 votes to his rival's 46,656.
In 2013, he refused to swipe t-shirts with an Israeli player in a display of support for Palestinian rights.
The western countries begin to establish diplomatic missions in the war-torn nation.
At the weekend, Guinea president responded by saying Somaliland had all rights to chart her destiny.