By Ahmed Elumami

TRIPOLI (Reuters) - A boat carrying migrants sank off Libya's Mediterranean coast, killing at least 37 people, a local official said on Sunday, the second such fatal accident within days.

"We had reports this morning that there are seven bodies of illegal migrants that sank off Khoms (east of Tripoli) ... but we don't have any details how many migrants were on board," said Mohamad al-Misrati, a spokesman for the Red Crescent in Tripoli.

Fishermen later discovered 30 more bodies in the same area near Khoms, a town some 100 km (62 miles) east of the capital, he said. Volunteers of the Red Crescent were trying to recover the dead but were lacking boats.

No more details were immediately available.

On Thursday, a vessel packed with migrants hoping to make it from Libya to Italy sank in waters off the Libyan town of Zuwara, killing up to 200 people.

Lawless Libya has turned into a major transit route for migrants fleeing conflict and poverty by boat to Europe. Smugglers exploit the country's chaos to bring Syrians into Libya via Egypt or nationals of sub-Saharan countries via Niger, Sudan and Chad.

The migrants pay thousands of dollars for the land and sea passage with smugglers often beating and torturing them to press for more money for the final leg of the trip by sea in unseaworthy vessels, rights groups say.

Libya has asked the European Union for help to train and equip its navy which was largely destroyed during the uprising in 2011 that toppled Moammar Gadhafi.

RTX1Q2FZ Libyan Red Crescent workers move the body of a dead migrant that was recovered by the Libyan coast guard after a boat sank off the coastal town of Zuwara, west of Tripoli, Aug. 28, 2015. Libya recovered 82 bodies washed ashore after the boat packed with migrants sank in the Mediterranean Sea and said more people were missing, feared dead. The vessel sank on Thursday after leaving Zuwara, a major launchpad for smugglers shipping migrants to Italy by exploiting a security vacuum in Libya where rival governments are fighting for control four years after the ousting of Moammar Gadhafi. Photo: Reuters/Hani Amara

But all training and cooperation was frozen in 2014 as the European Union boycotted a self-declared government controlling western Libya, which seized the capital Tripoli a year ago by expelling the official premier to the east.

Western and most Arab powers only deal with the eastern-based government, which has no control of western Libya from where boats are launched due to its proximity to the Italian island of Lampedusa.

The number of refugees and migrants crossing the Mediterranean to reach Europe has passed 300,000 this year, up from 219,000 in the whole of 2014, the U.N. refugee agency UNHCR said on Friday.

More than 2,500 people have died making the crossing this year, not including those feared drowned off Libya in the last 24 hours, it said. That compares with 3,500 who died or went missing in the Mediterranean in 2014.

(Reporting by Ahmed Elumami and Hani Amara; Writing by Ulf Laessing; Editing by Mark Heinrich and Lisa Shumaker)