KABUL, April 22 (Reuters) - Nineteen people, including a British soldier, have been killed in Afghanistan in a series of attacks in the past two days, officials said on Tuesday, in the latest violence following the traditional winter lull.

An Afghan police official said four policemen died on Tuesday in a remote-controlled bomb attack in Spin Boldak, a town near the Pakistan border in southern Afghanistan.

On Monday, seven Taliban insurgents were killed in an air strike by U.S.-led troops while planting roadside bombs in the southeastern province of Paktia, a provincial police official said.

In a separate incident also on Monday, four Taliban fighters and three Afghan policemen were killed in a clash in the Marouf district of southern Kandahar, Mohammad Anwar, a police officer in Kandahar, told Reuters.

The fighting erupted after Taliban militants attacked a police checkpoint, the officer said.

The British soldier was killed on Monday when a roadside bomb hit his vehicle as it guarded a supply convoy travelling to Camp Bastion, the main British base in Helmand province, the British Ministry of Defence said.

The Taliban, who are leading an insurgency against the government and foreign forces after being ousted from power in 2001, could not be reached for comment.

The death brings the number of British soldiers killed in Afghanistan since the overthrow of the Taliban in late 2001 to 94. There are some 7,800 British troops in Afghanistan, stationed mainly in the south.

Three soldiers from the NATO-led International Security Assistance Force (ISAF) were also wounded in two separate explosions in the south of the country, the ISAF said. (Reporting by Jonathon Burch, Saeed Ali Achakzai and Kamal Sadat; Editing by Sami Aboudi)