A Syrian-registered minibus has exploded at a border crossing on Turkey's border with Syria, injuring or wounding dozens.
Turkish officials said at least 13 people, including Turkish nationals, were killed in the February 11 blast at the Cilvegozu border post.
Dozens more were injured.
Deputy Prime Minister Bulent Arinc said the government was investigating all possible causes for the blast, including a suicide attack, but said it was too early to draw conclusions.
Cilvegozu is one of the main crossing points for Syrian refugees fleeing to Turkey to escape the nearly two-year-old confict in their country that erupted amid Arab Spring-style protests around the region.
Turkey is a strong supporter of the Syrian rebels fighting to topple President Bashar al-Assad's regime and hosts thousands of Syrian refugees.
Based on reporting by Reuters, AP, and dpa