SANTIAGO, Chile (AP) — Chile sought help from foreign security agencies in identifying those responsible for an explosion that injured 14 people at a subway station in the capital, while bomb scares and small blasts kept the country on edge Wednesday.

Prosecutor Raul Guzman didn’t say which countries had been contacted, but said “international agencies” had been asked for help in the investigation into the blast, which was the latest in a wave of 29 small bombings or attempted bombings in Santiago this year.