It was a sad Tuesday for authorities in Kenya following an attack by gunmen on a hotel, leaving 14 people dead and many others injured.

The attack involved at least four armed men who invaded the hotel and shops.

Al-Shabaab, the Al-Qaeda-linked Somali group that assaulted a Nairobi shopping mall in 2013, claimed responsibility for Tuesday's attack on the DusitD2 compound, which includes a 101-room hotel, spa, restaurant, and offices for local and international companies.

Kenya's Citizen TV aired security-camera footage that showed at least four heavily armed men in dark-colored, paramilitary-style gear.

The coordinated assault began with an explosion that targeted three vehicles outside a bank, and a suicide bombing in the hotel lobby that severely wounded a number of guests, said Kenya's national police chief, Joseph Boinnet.

Kenyan hospitals appealed for blood donations even as the number of wounded remained unclear.

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Associated Press video from inside the hotel showed Kenyan security officers searching the building and scared workers emerging from hiding while gunfire could still be heard. Some climbed out a window by ladder. One man got up from the floor where he appeared to be trying to hide under a piece of wood paneling, then showed his ID.

Like the attack at the Westgate Mall, this one appeared aimed at wealthy Kenyans and foreigners. It came a day after a magistrate ruled that three men must stand trial in connection with the Westgate Mall siege.

Al-Shabab has vowed retribution against Kenya for sending troops to Somalia to fight it since 2011. Tuesday's violence came three years to the day after al-Shabab extremists attacked a Kenyan military base in Somalia, killing scores of people.

The group has killed hundreds of people in Kenya. In the deadliest attack, al-Shabab claimed responsibility for an assault on Kenya's Garissa University in 2015 that killed 147 people, mostly students.

The latest carnage demonstrated al-Shabab's continued ability to carry out spectacular acts of bloodshed despite a dramatic increase in U.S. airstrikes against it under President Donald Trump.

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