Story highlights Security officials say 13 people and all three attackers were killed

"Blood is everywhere," a witness says, describing the scene at a nearby hospital

Hotel is popular among politicians, Westerners

Mogadishu, Somalia (CNN) Suspected Al-Shabaab gunmen set off an explosion and stormed a popular hotel in Somalia's capital Wednesday, killing at least 13 people and three attackers, a security official said.

A lengthy siege at Mogadishu's Ambassador Hotel ended early Thursday, said Somali security official Ahmed Barre.

One militant died in an initial car bomb attack, according to the National Intelligence and Security Agency.

Barre said the other two were killed by Somali special forces.

At least 40 other people were injured in the attack, according to Capt. Da'ud Hajji, a senior Somali police officer.

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