SEOUL, South Korea — North Korea launched several short-range missiles off its coast on Saturday, damping hopes in Washington and South Korea that the country would restrain from provocations to help pave the way for dialogue.

The missiles blasted off from a coastal launching site and flew about 155 miles to the northeast before falling into the sea, the South Korean military said in a statement. Military officials were analyzing data to determine what type of missiles were used, it said.

The launchings occurred in a period of escalating tensions between the government of Kim Jong-un and the Trump administration. American and South Korean forces began twice-yearly war games on Monday aimed at preparing for a possible attack by the North. The games continue until the end of August.

The United States Pacific Command detected and tracked three short-range ballistic missile launchings, according to a spokesman, Cmdr. Dave Benham.