(CNN) -

Gunmen raided two separate areas in coastal Kenya over the weekend, leaving at least 13 people dead, authorities said.

Four people died when attackers opened fire in Hindi, near the popular tourist coast of Lamu, on Saturday night, the Kenyan Red Cross said in its preliminary assessment.

Hindi is near Mpeketoni, where assailants killed 65 people under the cover of darkness last month.

A second raid Saturday took place at a police station in Gamba and left nine people dead. One other person was hospitalized, and another was reported missing.

Kenya's tourism industry has taken a hit amid attacks in the coastal region. In May, tour companies evacuated hundreds of vacationers from Kenya after the UK and the United States issued travel alerts that warned of a "high threat" of terrorist attacks.

Al-Shabaab, a Somali-based militant group, has claimed responsibility for most attacks. It's unclear whether the group was behind the weekend attacks.

The Kenyan military crossed into Somalia in 2011 to battle Al-Shabaab, which it blamed for kidnapping tourists in the coastal region. In retaliation, the terrorist group has launched a spate of attacks, including targeting bustling bus stations with grenades.

Last year, militants stormed the Westgate Mall in Nairobi and held shoppers under siege for days. At least 67 people were killed.