Four commercial vessels were targeted by "sabotage operations" near the territorial waters of the United Arab Emirates without causing casualties, the foreign ministry said on Sunday in a statement carried by state news agency WAM.
The incident occurred near the UAE emirate of Fujairah, it said.
"Subjecting commercial vessels to sabotage operations and threatening the lives of their crew is considered a dangerous development," said the ministry.
The ministry said it had launched an investigation in coordination with international authorities.
There had been "no injuries or fatalities on board the vessels."
The statement added that the incident did not result in "spillage of harmful chemicals or fuel."
