WASHINGTON — Computers and cellphones seized during a deadly Special Operations raid in Yemen in January offer clues about attacks Al Qaeda could carry out in the future, including insights into new types of hidden explosives the group is making and new training tactics for militants, according to American officials.

But it is still unclear how much the information advances the military’s knowledge of the plans and future operations of Al Qaeda’s branch in Yemen, although it may give a glimpse of its evolving tactics, the officials said.

The Trump administration has been eager to defend itself against assertions that the raid of a Qaeda safe house, in which a member of the Navy’s SEAL Team 6 was killed, was a failure because little meaningful intelligence material was seized. A military investigation was also ordered to determine whether women and children died in the raid.

In his address to Congress on Tuesday, President Trump called the raid “highly successful” and said Defense Secretary Jim Mattis had assured him that it had yielded “large amounts of vital intelligence that will lead to many more victories in the future against our enemy.”

