"U.S. citizens in Senegal should be aware of their surroundings at all times and use caution when moving around," a travel advisory read. "U.S. citizens should avoid crowds, demonstrations, political rallies and spontaneous gatherings in Senegal."
Incumbent President Abdoulaye Wade secured the right to seek a third term after a court ruled he was exempt from a term limit because the laws were adopted after his inaugural election in 2000. The United Nations said it had evidence that at least four people, including a police officer, were killed in political violence in the wake of the announcement.
Former Prime Minister Macky Sall secured 26.5 percent of the vote compared to 34.8 percent for Wade.
Sall, in his first campaign for president, said he was certain he would unseat Wade.
Because neither candidate secured a majority, a second round of voting is scheduled for March 18.