A hand grenade thrown at a model truck has shocked local residents in Port town of Merca, Shabelle news reported.
Health sources confirmed that four civilians, among them a woman, were wounded and rushed to nearby medical centres.
Sources in the hospital told Shabelle that one person suffered critical wounds.
The explosion also caused damage to property, particularly the truck that had been targeted and a house near by.
A tea sales woman at the scene told Shabelle News that a hand grenade was thrown while no one has claimed responsibility.
Meanwhile, deputy chairman of lower Shabelle region has declined to comment about the incident.
Itsí the sixth attack in the city in the last few months, and analysts say it may be a sign of a growing uprising in the region.
142 illegal immigrants detained in Greece
ATHENS, Greece (UPI) Greek police arrested 142 people trying to cross the country`s borders illegally in three different groups by truck and boat.
All three groups had come from Turkey, Ekathimerini.com reported.
The first arrests involved 73 people found in a refrigerator truck in Kavala in northwest Greece. The group included individuals from Afghanistan, Iraq, Iran, Sudan, Ethiopia, Somalia and Palestine, with 16 women and a boy as well as men.
The driver of the truck fled, but three people in cars escorting the truck were arrested.
Another 32 people were rescued off the island of Chios from a leaky wooden boat. A second boatload of 37 illegal immigrants was found early Monday off the island of Samos.