The U.S. Embassy in Baku has received credible reports of potential terrorist attacks and kidnappings against U.S. citizens and foreign nationals in Baku, including against hotels such as the J.W. Marriott Absheron, as well as potentially other locations in Baku.  U.S. citizens are advised to exercise heightened caution in locations where Americans or foreigners may gather.

According to Travel.State.Gov, Azerbaijan has a longstanding risk presented by terrorist groups, who continue plotting possible attacks in Azerbaijan. Terrorists may attack with little or no warning, targeting tourist locations, transportation hubs, markets/shopping malls, local government facilities, hotels, clubs, restaurants, places of worship, parks, major sporting and cultural events, educational institutions, airports, and other public areas. 

However, Azerbaijani media accused Armenians in plotting the attacks on Baku.

According to haqqin.az, the message from the US Embassy echoes the information received by the Azerbaijani special services. So, according to information received by the State Security Service (SSS) of Azerbaijan, the special services of Armenia, in order to hide a series of defeats of their armies at the front, intend to carry out terrorist, provocative acts and other acts in large cities of Azerbaijan, namely in crowded places and in public transport.

Source: haqqin.az ; azconsulate.com.ua