Three explosions shook the Ethiopian capital Addis Ababa on Tuesday, injuring at least four people, in what police called an attempt by unknown culprits to "disrupt the peace and tranquility of the nation", Reuters reported. One blast hit the Lalibela restaurant in the southern part of the city, extensively damaging the structure. Restaurant manager Asnketch Makaonnen said the explosion was caused by a bomb planted in a flower pot outside. "I was in my office when I heard the explosion. I came to the restaurant and I found it filled with smoke. We tried to lead the clients through the back door," Makaonnen said. "Luckily none of the restaurant staff were injured except four pedestrians," she added. Another explosion struck a market, also in the south of the city, damaging a bookstore and auto parts shop. Police said the device was hidden in a rubbish bin. There were no injuries. A third, later blast occurred outside the gate of a hotel and tourism training centre in the city centre, damaging a cafeteria inside. No one was injured in the blast, which also damaged a small guard shack at the gate. --More 20 58 Local Time 17 58 GMT