The Israeli military has begun pumping seawater into Hamas's tunnel complex in Gaza, the Wall Street Journal reported on Tuesday citing unnamed U.S. officials, adding that the process would likely take weeks.

Some Biden administration officials have said the process could help destroy the tunnels, where Israel believes the militant group is hiding hostages, fighters, and munitions, the Journal reported. Other officials have expressed concerns the seawater would endanger Gaza's fresh water supply, the newspaper reported.

Israel's military did not immediately provide comment on the report. An Israeli defense ministry spokesperson did not immediately respond to a request for comment.

(Reporting by Susan Heavey and Rami Ayyub)