TOKYO — Highly radioactive water is still gushing into the Pacific from Japan's tsunami-crippled nuclear plant despite efforts to stop it with a chemical substance mixed with sawdust and shredded newspaper.

Nuclear safety agency spokesman Hidehiko Nishiyama says the polymer mix has not yet sealed the crack in a maintenance pit that is spewing water into the sea. Engineers have not given up and say they should know by Monday whether it will work.

An earlier attempt to seal the crack with concrete failed. The Fukushima Dai-ichi nuclear plant has been leaking radiation since the March 11 earthquake and tsunami. The latest leak was discovered Saturday.

The contaminated water will quickly dissipate in the ocean but could pose a danger to workers at the plant. (AP)