Two vessels have reported suspicious approaches by a skiff in the Gulf of Aden on Thursday.
Security consultancy Ambrey reported that the ships spotted a boat when they left the Bab el Mandeb Strait.
The first incident took place at 0804 GMT and is reported to have involved a Hong Kong-flagged LPG carrier eastbound at 13.5 knots.
The skiff was making 19 knots.
