A homophobic mob reportedly hurled rocks and home-made bombs at a same-sex wedding involving a British Red Cross worker in Port-au-Prince.
The US Supreme Court has ruled married gay couples should be entitled to the same benefits as heterosexual couples.
The introduction of gay marriage moved another step closer to becoming law after legislation cleared a major hurdle in the House of Lords.
An anti-gay marriage group said today's House of Lords vote showed there was "huge opposition to almost every part of the bill".
Peers rejected a bid to block the Government's plan to legalise gay marriage by 390 votes to 148.
– Colin Hart, Campaign Director for the Coalition for Marriage
The Government may have won the vote today but what was clear from the debate was the huge opposition to almost every part of the Bill.
We will continue to campaign to save traditional marriage and today's vote and the concerns expressed by many peers mean we will be able to introduce safeguards that will protect teachers, registrars, chaplains and anyone who works in the public sector. If the Government refuse to accept these changes, they risk losing the legislation at third reading.
The gay marriage bill cleared another major parliamentary hurdle after the House of Lords overwhelmingly rejected a bid to block the legislation.
But as in the Commons, it prompted a heated and divisive debate in the packed House.
The gay marriage bill, which cleared a major parliamentary hurdle after the Lords rejected a bid to block the amendment, will face further tests including a detailed line-by-line scrutiny in its later stages.
The marathon debate over the bill, with more than 90 speakers over two days, revealed deep divisions over the controversial measure in the Upper House.
MPs have already backed the Bill, which applies to England and Wales, despite opposition from dozens of Tory backbenchers.
The result in the House of Lords tonight was greeted with cheers from supporters of gay marriage outside Parliament.
The House of Lords have voted on gay marriage. The amendment in the Lords aimed at derailing the equal marriage bill has been defeated by a big majority - 390 to 148.
Research of Tory Associations by ITV News shows that 73% have lost members - half of which (51%) said it was because of gay marriage.
Three out of four Tory Associations we contacted said members had left the party. Out of them, over half said gay marriage was the reason they left.
Liberal Democrat Baroness Barker has told peers she had had a female partner for many years and strongly welcomed the Bill.
Lady Barker said the legislation reflected "the wishes of people who don't today just want to tolerate the views of lesbians and gay men but want to celebrate and support them as people in their own right."
She said: "I look forward to joining with people on all sides of this House to ensure that gay people and their families are afforded the dignity and respect that others take for granted and that families, faiths and communities can grow stronger together as a result."
Lord Chris Smith has spoken about how civil partnerships, "still labels our lesbian and gay relationships as somehow just a little second-class."
Lord Smith is often credited as the first openly gay MP and told the House of Lords tonight; "I happen to be gay...I am also a Christian and I believe in a loving, accepting, generous God who wants to include people not reject them."
Speaking as part of the debate on the Marriage (Same Sex Couples) Bill Lord Smith said: "Quite simply this is about love, commitment and mutual respect."
An Independent Peer has urged the House of Lords to block controversial plans to allow gay marriage after a bitter battle in the Commons.
Lord Dear demanded that the Marriage (Same Sex Couples) Bill should be refused a second reading.
Lord Dear warned that the "ill-considered Bill seeks to overturn centuries of tradition, heedless of public opinion and the views of religious leaders, and blind to the laws of unintended consequences".
Lord Dear also warned the Bill could be "counter-productive" in promoting tolerance for homosexual relationships.
"I fear the Bill, should it become law, could well create such opposition to homosexuals in general that the climate of tolerance and acceptance in this country, that we have all championed and supported and seen flourish over the years, could well be set back by decades."
But for the Government, Baroness Stowell of Beeston hailed the legislation as a "force for good" which would strengthen the institution of marriage.
More than 90 peers are due to speak in the debate which is scheduled to continue late into tonight and overspill into tomorrow's business when the crucial second reading vote will be taken.
The Prime Minister is facing fresh calls to halt his plans to allow gay marriage by a group of religious leaders, who argue the legislation is being rushed through parliament without proper debate.
In a letter to the Daily Telegraph, signed by 61 religious leaders, it said:
The haste with which this legislation is being driven through Parliament and the failure to talk to all religions will mean that the problems which we have repeatedly highlighted will be written into law with serious and harmful consequences for the health of society, family life, and human rights such as freedom of religion and of speech.
Dismissing safeguards in the proposed law as insufficient, they continued: "It is surely clear that there are significant problems with this legislation which require further scrutiny and probably amendment.
We therefore urge you to pause so that this may take place.
Because of its serious flaws we will continue to resist this proposed legislation and to highlight its injustice and unfairness. It creates a two-tier form of marriage in one of which the importance of consummation, procreation and the welfare of children, as well as issues such as adultery have been ignored, and devalues the meaning of marriage itself.
A letter to the Daily Telegraph, signed by 61 people describing themselves as "leaders of Britain's major faiths", said the controversial legislation was being rushed through Parliament without proper debate.
Christian, Jewish, Muslim, Hindu and Buddhist figures were among those behind the appeal for a "pause".
The Marriage (Same Sex Couples) Bill arrives in the Lords on Monday for the start of what is expected to be a stormy passage through the upper chamber.
It survived a Commons backlash when 130 Tory backbenchers opposed the move.
Bishop Michael Hill, the Anglican Bishop of Bristol, Archbishop Bernard Longley, the Roman Catholic Archbishop of Birmingham and Bishop Angaelos of Britain's Coptic Orthodox Church, were among signatories.