ST. LOUIS (AP) — St. Louis Mayor Francis Slay says he won’t seek re-election in 2017.

The Democratic mayor made the announcement Friday during a brief news conference at city hall. He didn’t give a reason but said it wasn’t health related. Slay didn’t rule out seeking another office but didn’t provide any details.

Slay is 61 and was first elected in 2001. He is the longest-serving mayor in the city’s history.

The surprising announcement came after two significant victories for the mayor in recent days. The director of the National Geospatial-Intelligence Agency announced last week that St. Louis is the preferred site for a new office that will keep 3,000 jobs in the city. This week, city voters approved a measure that will retain the city’s earning tax.