The latest pipe-bomb campaign against Gaelic clubs in the North could result in children being killed, the GAA has warned.
An explosive device was yesterday defused at a GAA club in Desertmartin, Co Derry - the third club in the county to be attacked in 24 hours.
A group calling itself the South Londonderry Volunteers later phoned a Belfast newspaper warning that further bombs had been left at five Co Derry GAA premises: Garvagh, Kilrea, Toome, Portglenone and Magherafelt.
Police were last night searching the clubs.
On Wednesday, army technical officers made safe pipe bombs at GAA grounds in Guladuff near Maghera, and Garvagh. The device in Guladuff was left in an oil tank enclosure.
A spokesman for Garvagh GAA, Mr Bernie Mullan, said the club was warning young people to be vigilant.
"The big danger is that on some occasion a child could come along and reach for one of these devices and cause serious injury or even death."
The club's secretary, Mr Karl McKillop, said Garvagh would have to reconsider its policy of letting children use the club unsupervised.
"Children are free at all times to use the pitch, in fact we welcome it, but under these circumstances we might have to review that situation.
"We can't really let them use the pitch because anything that looks like an empty Coke can or an empty bottle could turn out to be something more serious," he said.
Mr McKillop said it was a mistake for loyalists to perceive the GAA as a nationalist organisation.
"There are plenty of clubs which have players of mixed religions and we are one of those clubs.
"In the past we have had players of various religions play for us and there have never been any problems."
Meanwhile, SDLP councillor Mr Joe McBride has condemned the Desertmartin attack as "blatant and sickening sectarianism".
"This is a further worrying development in the growing number of attacks on GAA premises, on innocent nationalists and commercial property. What do those behind this kind of attack hope to achieve?" Meanwhile, the leader of the UDP, Mr Gary McMichael, denied allegations that the paramilitary UDA, which is officially on ceasefire, was involved in the attacks.
"It is quite clear there are a number of dissident groups who have been involved in this type of campaign," he said.
A number of GAA clubs were targeted last month.
On July 29th, Gavin Brett (18) was shot dead as he stood outside St Enda's GAA club on the outskirts of north Belfast.
Ten days earlier a clubhouse in Kilkeel, Co Down, was destroyed in an arson attack.