Around 100 people are feared drowned in the Mediterranean after a migrant dinghy capsized off Libya, according to rescue teams frantically searching for survivors in darkness and rough seas. German NGO Jugend Rettet, whose boat was at the scene, said 23 survivors had been rescued by an oil tanker which was first to reach the stricken boat yesterday. The crews are searching for survivors in the water and recovering dead bodies, it added in a tweet.<br/><br/>Attempts to find any survivors were continuing but were being hampered by very rough conditions and the chances of finding anyone alive appeared slim. UN refugee agency (UNHCR) officials said yesterday that dozens of people likely perished before a merchant ship reached that dinghy, which was of a type that normally have had 100-150 passengers packed on board. According to the UN refugee agency the latest deaths add to a tally of 4,271 mostly African people who have died trying to cross the Mediterranean this year.