staff were taken to hospital and the sitting was suspended for almost two hours. In 1978, activist Yana Mintoff and another dissident threw bags of horse manure, and in June 1996 demonstrators dropped leaflets. Concern about such attacks and a possible chemical or biological attack led to the installation of a glass screen across the Strangers' Gallery in early 2004. The new barrier does not cover the gallery in front of the Strangers' Gallery, which is reserved for ambassadors, members of the House of Lords, guests of MPs and other dignitaries, and in May 2004 protesters from Fathers 4 Justice attacked Prime Minister Tony Blair with flour bombs from this part, after obtaining admission by bidding for a place in the visitors' gallery in a charity auction. Subsequently, rules on admission to the visitors' galleries were changed, and now individuals wishing to sit in the galleries must first obtain a written pass from a Member certifying that that individual is personally known to them. In September of the same year, five protesters opposed to the proposed ban on fox hunting disrupted the proceedings of the House of Commons by running into the Chamber, the first such occurrence since King Charles I's unauthorised entry in 1642, which triggered the English Civil War. The House of Lords has also been targeted by protesters. On 2 February 1988, the House debated the Local Government Bill's controversial Clause 28, a measure to prohibit the promotion of homosexuality in schools. Following the division, in which the clause passed, a number of lesbian demonstrators in the public gallery started chanting slogans, and three of them tied ropes to the railing and climbed down onto the floor of the Chamber. Lord Monkswell, who had provided the women with passes to attend the debate, later apologised to the House for the incident but did not criticise the protest. Similar actions have been carried out outside the Palace of Westminster. Early in the morning of 20 March 2004, two Greenpeace members scaled the Clock Tower to demonstrate against the Iraq War, raising questions about the security around such a likely target of terrorist attacks. In March 2007, another four members of Greenpeace made their way to the Palace's roof by means of a nearby crane, which was being used for repairs to Westminster Bridge. Once up, they unfurled a banner protesting against the British government's plans to update the