Two humpback whales that were seen floating dead off the coasts of New York and New Jersey earlier this week had evidence of experiencing blunt force trauma, officials said.

One was a 47-foot male floating off eastern Long Island, and the other was a 28-foot female in Raritan Bay between New York and New Jersey. Though the two whales were both first spotted on Wednesday, their different levels of decomposition indicate that their deaths were unrelated, the National Oceanic and Atmospheric Administration said in a Facebook post on Friday.

NOAA also announced the suspected cause of death for each whale. The male likely died of blunt force trauma, while the female is suspected to have been killed by blunt & sharp force trauma consistent with vessel strike.