Pakistani security forces killed at least 27 people in an exchange of gunfire with insurgents who have been holding a train since Tuesday in southwestern Balochistan province thought to have had hundreds aboard.

A military operation against militants who hijacked a train carrying hundreds of passengers in southwest Pakistan has ended, a spokesman for the army said late on Wednesday. Some 33 militants and 21 hostages were killed during the operation,

The Trump administration has ended $20 billion in funding for greenhouse gas reduction projects in a move that climate advocates and Democrats say illegally seizes money allocated for clean energy and transportation for disadvantaged communities.

Pakistan's military spokesman said on Friday the death toll in a train hijacking in the country's southwestern mountains had risen to 31 and he repeated accusations that neighbouring India and Afghanistan backed the militants who carried it out.

The Baloch rebels, who hijacked Jaffar Express train in Pakistan, claimed to have killed all the 214 hostages as their deadline for a deal to swap them with Baloch political prisoners ended on Friday.