Hezbollah's leader says the Iran-backed militant Shia group and its allies have achieved "victory" in Lebanon's first parliamentary elections since 2009.
Although the official results have not been announced, Hassan Nasrallah said their gains guaranteed the protection of the "resistance" against Israel.
Sunni Prime Minister Saad Hariri said his Western-backed Future Movement had lost a third of its seats.
Mr Hariri is still expected to be asked to form a new unity government, according to BBC.
But analysts said he would emerge a weaker figure, and be even less able to exert influence over Hezbollah than he was in the past.
A power-sharing system stipulates that the prime minister should be a Sunni Muslim, the speaker of parliament a Shia and the president a Maronite Christian.
In a televised address a day after the elections, Hassan Nasrallah declared what he called a "great political and moral victory for the resistance option that protects the sovereignty of the country".
He did not say how many seats his group and its allies had secured, but said the aim of their election campaign had been "achieved and accomplished".
Reuters news agency said a tally based on preliminary results showed Hezbollah and its allies had won at least 67 of the 128 seats in parliament. But the number of Hezbollah MPs was little changed at around 13.
