South Korean President Park Geun-hye said on Monday the actions of some crew of a ferry that sank with hundreds feared dead were tantamount to murder, as a four-year-old video transcript showed the captain promoting the safety of the same route. Sixty-four people are known to have died and 238 are missing, presumed dead, in the sinking of the Sewol ferry last Wednesday. Most of the victims are high school children. Captain Lee Joon-seok, 69, and two other crew members were arrested last week on negligence charges, with prosecutors announcing four further arrests - two first mates, one second mate and a chief engineer - on Monday. Lee was also charged with undertaking an "excessive change of course without slowing down" while traversing a narrow channel.