MOGADISHU, Somalia — A huge explosion from a truck bomb killed 20 people in Somalia's capital, police said Saturday, as shaken residents called it the most powerful blast they'd heard in years.

The explosion appeared to target a hotel on a busy road in Hodan district and at least 15 people were injured, police Capt. Mohamed Hussein said. Security forces had been trailing the truck after it raised suspicions, he said.

Gunshots could be heard at the site, and ambulance sirens wailed across the capital