Story highlights At least two explosions are heard in central Mogadishu, security forces rush to the scene

A Somali security agency tweets the "rescue mission" ends with several dead, including four attackers

(CNN) Explosions and gunfire echoed around Somalia's capital on Friday night, evidence of another spate of violence in the East African nation.

A large blast rocked central Mogadishu followed by the rattle of bullets, according to a Somali official nearby. Another, smaller explosion -- not to mention continued gunfire -- could be heard about 30 minutes later.

Somali security forces, meanwhile, rushed to the scene of the apparent violence, a Somali police source told CNN.

The National Intelligence and Security of Agency (NISA) of Somalia tweeted that the Hotel SYL was apparently targeted, though it wasn't clear if the attackers got past the hotel's gates.

The same agency later added, around 9:30 p.m. (1:30 p.m. ET), that its "rescue mission" had "concluded" with four attackers killed and several other people dead.

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