UKMTO warning - Vessel attacked

WARNING-WARNING-WARNING
A Merchant vessel was attacked in position 253200N 0573300E at 1440Z on 7 May 2017.
Vessels transiting the area are advised to exercise extreme caution
UKMTO Watchkeeper
Further information, 3 skiffs and mother vessel, skiffs approached fast from stbd bow, mother vessel approaching from astern, ladders sighted.