Searchers were looking on Wednesday for two crew members who had been onboard a Navy aircraft that crashed near Mount Rainier in Washington State during a training flight a day earlier, according to Navy officials.

The condition of the two people was not known as of Tuesday, according to the Navy, and on Wednesday it said that it had no additional updates. It did not identify the two crew members.

The cause of the crash, which took place after 3 p.m., was being investigated, the Navy said. Search and rescue teams from the Naval Air Station Whidbey Island, along with an MH-60S helicopter, headed to the crash site east of Mount Rainier to look for the crew members, it said.

The squadron had returned to Whidbey Island from a recent deployment, the Navy said in its statement on Tuesday. It had carried out operations in the Southern Red Sea, Bab el-Mandeb Strait and the Gulf of Aden to “maintain the freedom of navigation in international waterways,” the Navy said in an earlier statement about the deployment.

During the nine-month deployment, the squadron had conducted nearly 700 combat missions to “degrade the Houthi capability to threaten innocent shipping,” the release said.

The Houthis, the de facto government in northern Yemen that is backed by Iran, have launched attacks on ships sailing through the Red Sea and the Suez Canal, a crucial shipping route.

All but one of the squadrons using the EA-18G Growler are based at the naval station on Whidbey Island, which is about 30 miles north of Seattle. The station had notified the public of scheduled training operations this week.