The conflict in Syria has led to fighting between rival factions in neighbouring Lebanon. Ten people are reported to have been killed and more than 20 wounded in the city of Tripoli. Jim Muir reports from Beirut.

The Tripoli clashes, involving small-arms fire, machine guns and rocket-propelled grenades, erupted on Friday night and continued into Saturday despite efforts by the authorities to calm the situation and insert security forces to keep the two sides apart. It's the most intensive

flare-up

since tensions over Syria

broke into

violence in Tripoli last month when 10 people were killed over nearly a week. The fighting is between local Alawites, who support the Alawite-dominated regime in Syria, and Sunnis, who back the Syrian uprising and have been accused of allowing guns to be smuggled to the mainly Sunni rebels across the border.

Pakistani officials say American air strikes have killed two suspected militants in the tribal region of South Waziristan. Reports say the men were senior commanders linked to a faction of the Pakistani Taliban, headed by the

warlord

Mullah Nazir. It was the sixth American drone attack in Pakistan in two weeks. In April, the Pakistani parliament demanded the US stop such attacks.

World News from the BBC

The medical charity Medecins Sans Frontieres says there's been a sharp increase in the number of refugees arriving in South Sudan, fleeing fighting north of the border. Between 2,000 and 4,000 people are crossing daily from Blue Nile province to escape fighting between the government in Khartoum and rebel forces. Here's our Africa editor Martin Plaut.