Actor Michael Sheen has spent time with Syrian refugees at a large camp in Lebanon but warns that cold weather presents a real threat.
The Government will urge for international action to protect women and girls from violence and sexual exploitation in emergency situations.
The violence in Syria threatens an uneasy truce in neighbouring Lebanon where guns have reappeared on the streets after years of peace.
The North African branch of al-Qaeda has blamed Lebanese group Hezbollah for the deadly bombings in the city of Tripoli, according to the US-based SITE monitoring service.
AQIM, al-Qaeda's north African branch, said in a tweet that it knew “with certainty” that Hezbollah was responsible for the twin blasts that have killed at least 42 people.
It added: "That vile party... should know that it will meet retribution soon.”
New CCTV footage has emerged of the moment a blast rocked a mosque in Lebanon.
The film shows one of the two mosques targeted in today's blast, just before the explosion in the northern city of Tripoli.
People are then seeing fleeing the mosque after the blast, some apparently stemming wounds as they escape.
It is understood one of the two mosques bombed is usually attended by Sunni cleric Sheikh Salem Rafii, although he was unharmed.
The death toll from Lebanon's Tripoli bombing has risen to 42 people, medical and security sources have told Reuters.
– Foreign office minister Alistair Burt
I condemn today’s abhorrent attacks in Tripoli, Lebanon; my thoughts are with those who have lost friends and family as a result.
It is important that the Lebanese authorities are given the support they need to investigate this attack fully and return calm to the streets of Tripoli.
Lebanon's health minister has updated the death toll from today's twin explosions to 27, with at least 358 wounded.
The death toll from two explosions in the Lebanese city of Tripoli has risen to 20, with 213 people wounded, the country's health minister has told local TV .
Two explosions outside mosques in Tripoli, Lebanon, have killed at least 13 people and wounded more than 50, security sources and witnesses told Reuters.
The blasts, which appeared to be coordinated, went off as Friday prayers ended in the largely Sunni Muslim city.
At least seven people have been killed and dozens wounded in an explosion outside a mosque in Tripoli, Lebanon, Reuters reports.
Earlier, two blasts, one outside the mosque after Friday prayers ended and another in central Tripoli, rocked the Lebanese city.
Two explosions have rocked the northern Lebanese city of Tripoli, with several casualties reported, witnesses and security sources told Reuters.
One blast was outside a mosque as Friday prayers ended and the other hit central Tripoli, the news agency reports.
Sirens were heard across the north of Israel and local eye witnesses say they heard five explosions.
The Israel Defence Forces (IDF) said they are sporadic rocket launches that are not from Hezbollah but could be from international jihadist groups in Tyre in southern Lebanon.
The Iron Dome intercepted one rocket, Israel said. No injuries were reported.