The signs say, ‘No more clothes’, but the message is ‘Please keep the donations coming’.

Glasgow Central Mosque is at the forefront of Scotland’s aid efforts to help flood-ravaged Pakistan.

Hundreds of volunteers at the mosque, in Ballater Street, Gorbals, are working around the clock sorting thousands of donations from concerned residents across the city.

Some 400 boxes of goods left the Islamic Centre last week for Pakistan, where 20million people have been affected by the flooding in an area roughly the size of Britain. More than 2,000 people have been killed.

Around £250,000 has been raised by the Islamic Centre, with the public walking in off the street to hand in cash.

The centre is now asking for donations of dried foodstuffs, especially baby milk, and money to buy medicines and tents to send in subsequent flights operated by Pakistan International Airlines.

Four volunteers from the Islamic Centre arrived in Pakistan last Thursday to help with the distribution of clothes, food and medicine from bases in Lahore and Islamabad. All four are paying for their own travel and accommodation.

The worst monsoon rains in 80 years have wiped out villages, bridges, roads, crops and livestock, and the death toll would escalate in the event of outbreaks of disease.

Muhammed Tufail Shaheen, president of charity Glasgow the Caring City, said: “They have lost everything. Their houses have gone, their crops have gone, their animals have been killed. They don’t have anything.

“It could be 10 years before we see a difference.

“The people of Glasgow are helping all the time. Glasgow is a multi-cultural society and anything we ask the people for, they help us.”

Mr Shaheen has a letter from the Pakistan government with a list of medicines most urgently required.

Donated medicines are sorted by pharmacists and doctors, who are among almost 200 regular volunteers.

The Islamic Centre donated £10,000 to help one severely-hit school in the Sindh province.

Last week, the Islamic Centre’s main hall played host to a multi-faith fundraising dinner organised by the Ucare Foundation. It was attended by House of Commons Speaker John Bercow and Deputy First Minister Nicola Sturgeon and raised more than £300,000.

Mohammed Sarwar, chairman of the Ucare Foundation and a former Glasgow MP, said: “Glasgow people and Scottish people have always responded with great generosity to national and international disasters.

“It is a very difficult time in Pakistan and people really want to help.”

Cash raised in Scotland will be used to build 200 homes in the Punjab, where millions are homeless.

In the Central Mosque storeroom there are almost 600 bags of goods still to be sorted and assigned to boxes to be flown to Pakistan.

One helper is Aisha, from Shawlands, who did not want to give her surname. Her parents were born in Pakistan and she said: “We have been overwhelmed by clothes.

“We are now looking for dried packets of foods, such as rice, pasta and noodles. We are trying to keep the nutritional values high.

“We start at 10am and some volunteers have been working until 8am the next day.

“When we see on television what is going on, and see the suffering, it is heart-breaking watching it.”

The biggest problem hampering the relief effort in Scotland is transport: there are only two flights a week from Glasgow Airport to Pakistan, with room to carry only a few thousand kilos of goods.

Hanif Raja, chairman of Pakistan Forum Scotland, said: “I’m appealing to airlines, especially to Emirates and other airlines carrying goods to Pakistan – they could come and rescue us.

“We have loads of stuff. I have medicine boxes lying in here, but have no carrier.”